diff --git a/contrib/packaging/hgpackaging/py2exe.py b/contrib/packaging/hgpackaging/py2exe.py
--- a/contrib/packaging/hgpackaging/py2exe.py
+++ b/contrib/packaging/hgpackaging/py2exe.py
@@ -25,7 +25,8 @@
                  python_exe: pathlib.Path, build_name: str,
                  venv_requirements_txt: pathlib.Path,
                  extra_packages=None, extra_excludes=None,
-                 extra_dll_excludes=None):
+                 extra_dll_excludes=None,
+                 extra_packages_script=None):
     """Build Mercurial with py2exe.
 
     Build files will be placed in ``build_dir``.
@@ -105,6 +106,16 @@
     env['DISTUTILS_USE_SDK'] = '1'
     env['MSSdk'] = '1'
 
+    if extra_packages_script:
+        more_packages = set(subprocess.check_output(
+            extra_packages_script,
+            cwd=build_dir).split(b'\0')[-1].strip().decode('utf-8').splitlines())
+        if more_packages:
+            if not extra_packages:
+                extra_packages = more_packages
+            else:
+                extra_packages |= more_packages
+
     if extra_packages:
         env['HG_PY2EXE_EXTRA_PACKAGES'] = ' '.join(sorted(extra_packages))
     if extra_excludes:
diff --git a/contrib/packaging/hgpackaging/wix.py b/contrib/packaging/hgpackaging/wix.py
--- a/contrib/packaging/hgpackaging/wix.py
+++ b/contrib/packaging/hgpackaging/wix.py
@@ -177,7 +177,8 @@
 
 
 def build_installer(source_dir: pathlib.Path, python_exe: pathlib.Path,
-                    msi_name='mercurial', version=None, post_build_fn=None):
+                    msi_name='mercurial', version=None, post_build_fn=None,
+                    extra_packages_script=None):
     """Build a WiX MSI installer.
 
     ``source_dir`` is the path to the Mercurial source tree to use.
@@ -189,6 +190,10 @@
     Mercurial but before invoking WiX. It can be used to e.g. facilitate
     signing. It is passed the paths to the Mercurial source, build, and
     dist directories and the resolved Mercurial version.
+    ``extra_packages_script`` is a command to be run to inject extra packages
+    into the py2exe binary. It should stage packages into the virtualenv and
+    print a null byte followed by a newline-separated list of packages that
+    should be included in the exe.
     """
     arch = 'x64' if r'\x64' in os.environ.get('LIB', '') else 'x86'
 
@@ -200,7 +205,8 @@
 
     build_py2exe(source_dir, hg_build_dir,
                  python_exe, 'wix', requirements_txt,
-                 extra_packages=EXTRA_PACKAGES)
+                 extra_packages=EXTRA_PACKAGES,
+                 extra_packages_script=extra_packages_script)
 
     version = version or normalize_version(find_version(source_dir))
     print('using version string: %s' % version)
@@ -280,7 +286,7 @@
 def build_signed_installer(source_dir: pathlib.Path, python_exe: pathlib.Path,
                            name: str, version=None, subject_name=None,
                            cert_path=None, cert_password=None,
-                           timestamp_url=None):
+                           timestamp_url=None, extra_packages_script=None):
     """Build an installer with signed executables."""
 
     post_build_fn = make_post_build_signing_fn(
@@ -292,7 +298,8 @@
 
     info = build_installer(source_dir, python_exe=python_exe,
                            msi_name=name.lower(), version=version,
-                           post_build_fn=post_build_fn)
+                           post_build_fn=post_build_fn,
+                           extra_packages_script=extra_packages_script)
 
     description = '%s %s' % (name, version)
 
diff --git a/contrib/packaging/wix/build.py b/contrib/packaging/wix/build.py
--- a/contrib/packaging/wix/build.py
+++ b/contrib/packaging/wix/build.py
@@ -34,6 +34,9 @@
                         help='URL of timestamp server to use for signing')
     parser.add_argument('--version',
                         help='Version string to use')
+    parser.add_argument('--extra-packages-script',
+                        help=('Script to execute to include extra packages in '
+                              'py2exe binary.'))
 
     args = parser.parse_args()
 
@@ -54,6 +57,9 @@
         'version': args.version,
     }
 
+    if args.extra_packages_script:
+        kwargs['extra_packages_script'] = args.extra_packages_script
+
     if args.sign_sn or args.sign_cert:
         fn = build_signed_installer
         kwargs['name'] = args.name