Building for different architecure on Apple Silicon

Hello,

I am trying to build i386 (x86) version of python 3.7 on a apple sillicon Mac. Because I want to embed a python tool (USDZ Tools) in my app's sandbox.

I tried to run this command in x86 and moved python 3.7 env to temp folder, then tried to build python3.7. Which spits out this error:
Traceback (most recent call last): File "./setup.py", line 2407, in <module> main() File "./setup.py", line 2402, in main "Tools/scripts/2to3", "Tools/scripts/pyvenv"] File "/Users/TD/Downloads/python3.7/build/components/cpython/Lib/distutils/core.py", line 148, in setup dist.run_commands() File "/Users/TD/Downloads/python3.7/build/components/cpython/Lib/distutils/dist.py", line 966, in run_commands self.run_command(cmd) File "/Users/TD/Downloads/python3.7/build/components/cpython/Lib/distutils/dist.py", line 985, in run_command cmd_obj.run() File "/Users/TD/Downloads/python3.7/build/components/cpython/Lib/distutils/command/build.py", line 135, in run self.run_command(cmd_name) File "/Users/TD/Downloads/python3.7/build/components/cpython/Lib/distutils/cmd.py", line 313, in run_command self.distribution.run_command(command) File "/Users/TD/Downloads/python3.7/build/components/cpython/Lib/distutils/dist.py", line 985, in run_command cmd_obj.run() File "/Users/TD/Downloads/python3.7/build/components/cpython/Lib/distutils/command/build_ext.py", line 340, in run self.build_extensions() File "./setup.py", line 272, in build_extensions missing = self.detect_modules() File "./setup.py", line 868, in detect_modules (tuple(int(n) for n in dep_target.split('.')[0:2]) AttributeError: 'int' object has no attribute 'split' make[3]: *** [sharedmods] Error 1 make[2]: *** [build_all_generate_profile] Error 2 make[1]: *** [profile-gen-stamp] Error 2 make: *** [profile-run-stamp] Error 2 ERROR make exited with code 2

This is probably an error caused by the build script, might need to cast dep_target into a String.

Any potential fix? If not I might have to tear down the entire USDZ Tools and re-write it in modern python or Swift. (I really don't want to do this, it uses a lot of dynamic linked libraries and .so objects.)

Some key requirements:
USDZ Tools only supports python 3.7.x on the x86 architecture (Thx Pixar). And I can not find alternative commandline tools that works well.
Have to run in an app sandbox, because I want to keep this app tidy and get it on App Store.
My app have to write in Swift, because it calls an first party API only supports Swift calling.

Start in setup.py at detect_modules, using the reported Python 3.7 i386 build traceback to inspect how dep_target is handled. Reproduce the build on Apple Silicon and verify that the resulting x86 Python 3.7 build completes for use with the USDZ Tools requirements.