I’m back having missed a step (not in debugging, in a real stair 
) so a bit of delay, I have a working Rumps version on Monterey (so needing sudo pip3 install pyobjc) here:
tomorrow I’ll try to test it on the other platforms.
Edit: works on BigSur (sudo pip3 install pyobjc needs some effort though), don’t work on Catalina, no impact on Linux or Windows (as could be expected).
I’ll do a PR on the real repo, wait a few days if anyone having a Mac tries the software, then if there is no move I’ll commit it with the PR 4921 and ask for a new Canary.