Played around with mach APIs a little to see how hard it is to inject code into a running process. Pretty similar to what you need to do on Windows.

Maybe this PoS code is helpful to others.

https://github.com/badlogic/macinject

https://cdn.masto.host/mastodongamedevplace/media_attachments/files/112/815/886/760/725/644/original/e6bbd39b00742379.mp4