Calling Python on z/OS from REXX - bpxwunix examples?

Have a dusty REXX that builds a report. Want to hand the heavy parsing to Python on USS (Open Enterprise Python is installed).

I know bpxwunix exists. Anyone have a boring production-style pattern for stdout/stderr stems and env (PATH, LIBPATH, _BPXK_AUTOCVT)?

Set PATH/LIBPATH to the Python install, turn on AUTOCVT, call bpxwunix with stem for stdout. Keep the Python script in USS not a PDS member if you can - fewer encoding surprises.

Other direction works too: Python subprocess to run REXX if the script lives in USS.

If the REXX must stay in a dataset, wrap it in a tiny JCL step and submit from ZOAU/Python instead. We did that for one stubborn tool.