Due to $reasons I came across this blogpost https://www.elttam.com/blog/env/ about turning ENV variables into code execution which is nice. But the Python vector is depending on Perl, I didn't like that :P.
Digging a bit deeper in the code often helps, so it did this time:
Looking at https://github.com/python/cpython/blob/d73634935cb9ce00a57dcacbd2e56371e4c18451/Lib/webbrowser.py#L51-L52 I could simplify the payload to:
PYTHONWARNINGS='module::antigravity.' BROWSER='sh -c id #%s' python whatever.py





