diff --git a/.github/workflows/build-pyicu-binary.yml b/.github/workflows/build-pyicu-binary.yml
new file mode 100644
index 000000000..a1b044808
--- /dev/null
+++ b/.github/workflows/build-pyicu-binary.yml
@@ -0,0 +1,121 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# pyicu-binary is PyICU's own gitlab.pyicu.org/main/pyicu tree (setup.py:
+# name="PyICU-binary"), which carries no wheel-build CI of its own.
+name: Build pyicu-binary wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'pyicu-binary version to build (git tag without leading v, e.g. 2.7.4)'
+        required: true
+        default: '2.7.4'
+  pull_request:
+    paths:
+      - '.github/workflows/build-pyicu-binary.yml'
+      - 'patches/pyicu-binary/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '2.7.4' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  # `inputs.version` is empty on pull_request events; default to 2.7.4 there.
+  PYICU_BINARY_VERSION: ${{ inputs.version || '2.7.4' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build pyicu-binary ${{ inputs.version || '2.7.4' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    steps:
+      # gitlab.pyicu.org isn't github.com, so actions/checkout can't reach it.
+      - name: Checkout pyicu v${{ env.PYICU_BINARY_VERSION }}
+        run: |
+          git clone --depth 1 --branch "v${{ env.PYICU_BINARY_VERSION }}" \
+            https://gitlab.pyicu.org/main/pyicu.git pyicu
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      - name: Apply riscv64 patches
+        working-directory: pyicu
+        run: git apply -v ../python-wheels/patches/pyicu-binary/${{ env.PYICU_BINARY_VERSION }}/*.patch
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          package-dir: pyicu
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # setup.py links ICU dynamically via icu-config/pkg-config; auditwheel
+          # then vendors libicudata/libicuuc/libicui18n into the wheel (the
+          # "-binary" in the name), which is what makes it self-contained. Its
+          # Unicode License requires the notice to travel with the binary.
+          CIBW_BEFORE_ALL_LINUX: >-
+            dnf -y install libicu-devel &&
+            cp /usr/share/licenses/libicu/LICENSE {package}/LICENSE.icu
+          CIBW_TEST_REQUIRES: pytest six
+          CIBW_TEST_SOURCES: pyicu/test
+          # 2.7.4's own tests hardcode CLDR-formatted strings and a tzdata
+          # transition pinned to ICU <=69 (test_DateTimeParserGenerator's
+          # own ICU_VERSION check tops out at "68.0"); manylinux_2_39
+          # links 74.2, whose newer CLDR/tzdata legitimately renders these
+          # four differently (e.g. narrow-no-break-space in "5:30 PM",
+          # Fiji's DST rule having no further transitions). Not a riscv64
+          # or code defect - deselect rather than chase upstream's CLDR pin.
+          CIBW_TEST_COMMAND: >-
+            python -c "import icu; print('linked ICU', icu.ICU_VERSION)" &&
+            python -m pytest pyicu/test
+            --deselect pyicu/test/test_DateTimeParserGenerator.py::TestDateTimePatternGenerator::testAddPattern
+            --deselect pyicu/test/test_DateTimeParserGenerator.py::TestDateTimePatternGenerator::testGetBestPattern
+            --deselect pyicu/test/test_DateTimeParserGenerator.py::TestDateTimePatternGenerator::testReplaceFieldType
+            --deselect pyicu/test/test_TimeZone.py::TestTimeZone::testTransition
+
+      - name: Check the wheel bundles ICU and its licence
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          for whl in sys.argv[1:]:
+              names = zipfile.ZipFile(whl).namelist()
+              assert any(n.split("/")[-1].startswith("_icu") and n.endswith(".so") for n in names), (whl, names)
+              assert any(".libs/" in n and "icu" in n.lower() for n in names), (whl, names)
+              assert any(n.endswith(".dist-info/licenses/LICENSE.icu") for n in names), (whl, names)
+              print(whl, "OK")
+          EOF
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: pyicu-binary-${{ env.PYICU_BINARY_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish pyicu-binary ${{ inputs.version || '2.7.4' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: pyicu-binary-${{ inputs.version || '2.7.4' }}-*-manylinux_riscv64
diff --git a/patches/pyicu-binary/2.7.4/0001-common-gate-the-deprecated-PyUnicode_WCHAR_KIND-cas.patch b/patches/pyicu-binary/2.7.4/0001-common-gate-the-deprecated-PyUnicode_WCHAR_KIND-cas.patch
new file mode 100644
index 000000000..b840b10e6
--- /dev/null
+++ b/patches/pyicu-binary/2.7.4/0001-common-gate-the-deprecated-PyUnicode_WCHAR_KIND-cas.patch
@@ -0,0 +1,53 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Tue, 8 Sep 2026 00:00:00 +0000
+Subject: [PATCH] common: gate the deprecated PyUnicode_WCHAR_KIND case out on
+ Python 3.12+
+
+Upstream-Status: Backport [https://gitlab.pyicu.org/main/pyicu/-/commit/8850cfca5aeaf040170edca6796002feff0eb82c]
+
+First released in v2.11 (an earlier attempt at the same fix is
+e7a54d1, tightened to this final form the next day by 8850cfc).
+
+CPython 3.12 removed the legacy PyUnicode_WCHAR_KIND enumerator along
+with the rest of the pre-3.3 "legacy Unicode" C API
+(Include/cpython/unicodeobject.h), so building this file against a
+3.12+ header fails with:
+
+    common.cpp: In function '...PyObject_AsUnicodeString(...)':
+    common.cpp:358:16: error: 'PyUnicode_WCHAR_KIND' was not declared
+    in this scope; did you mean 'PyUnicode_4BYTE_KIND'?
+
+Every other PyUnicode_KIND case already predates the switch this
+enumerator lives in, so the fix is the same one upstream shipped two
+releases after 2.7.4: only compile the WCHAR_KIND arm on interpreters
+old enough to still declare it.
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ common.cpp | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/common.cpp b/common.cpp
+index 601f1c3..98f86ff 100644
+--- a/common.cpp
++++ b/common.cpp
+@@ -355,6 +355,7 @@ EXPORT UnicodeString &PyObject_AsUnicodeString(PyObject *object,
+         PyUnicode_READY(object);
+ 
+         switch (PyUnicode_KIND(object)) {
++#if PY_VERSION_HEX < 0x030c0000
+           case PyUnicode_WCHAR_KIND: {  // this code path should be deprecated
+               if (SIZEOF_WCHAR_T == sizeof(UChar))
+               {
+@@ -381,7 +382,7 @@ EXPORT UnicodeString &PyObject_AsUnicodeString(PyObject *object,
+               }
+               break;
+           }
+-
++#endif
+           case PyUnicode_1BYTE_KIND: {
+               Py_ssize_t len = PyUnicode_GET_LENGTH(object);
+               Py_UCS1 *pchars = PyUnicode_1BYTE_DATA(object);
+--
+2.43.0
diff --git a/patches/pyicu-binary/2.7.4/0002-setup-rename-the-project-to-PyICU-binary.patch b/patches/pyicu-binary/2.7.4/0002-setup-rename-the-project-to-PyICU-binary.patch
new file mode 100644
index 000000000..da9cb2c5c
--- /dev/null
+++ b/patches/pyicu-binary/2.7.4/0002-setup-rename-the-project-to-PyICU-binary.patch
@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Tue, 8 Sep 2026 00:00:00 +0000
+Subject: [PATCH] setup: rename the project to PyICU-binary
+
+Upstream-Status: Inappropriate [the gitlab.pyicu.org/main/pyicu git tree itself always names the project "PyICU" (checked at tag v2.7.4); "PyICU-binary" is the distribution name whoever runs the actual PyPI release renames it to before building, done outside this git tree, so it is not something to submit upstream]
+
+The PyPI project this repo is porting, and the one pypi.riseproject.dev
+is meant to mirror, is "PyICU-binary" (see PyPI's own PyICU-binary
+sdist, whose setup.py carries this exact name= override) - the plain
+git checkout the workflow builds from stays "PyICU" throughout its
+history, including at the v2.7.4 tag. Without this the built wheel's
+own METADATA reports Name: pyicu, and _publish-wheel.yml derives the
+published package name straight from that field, so the workflow would
+register and publish the wrong package.
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ setup.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 3d85f87..ff78c9f 100644
+--- a/setup.py
++++ b/setup.py
+@@ -246,7 +246,7 @@ if sys.version_info < (2, 4):
+         return iterable
+
+
+-setup(name="PyICU",
++setup(name="PyICU-binary",
+       description='Python extension wrapping the ICU C++ API',
+       long_description=open('README.md').read(),
+       long_description_content_type="text/markdown",
+--
+2.43.0