Also part two, MacOS ARM binaries will require code signing, $99 USD per year.
https://developer.apple.com/support/compare-memberships/
The instructions at https://wiki.strawberrymusicplayer.org/wiki/Compile_macOS_using_homebrew work for me (with a few modifications for /opt/homebrew), however I can't run any resulting binary as I get the exception "EXC_BAD_ACCESS (SIGKILL (Code Signature Invalid))".
Strawberry installed from Homebrew does work nicely through Rosetta however.