Aren't you fearing of infringing Apple's IP since you have reimplemented their API, or you haven't reverse engineered their API (incl. private & internal) so it is actually a clean room design?
Long answer: Advanced Mac Substitute is factored into back end (the emulator itself) and front end (graphics and user input terminal). Writing a new front end from scratch is actually not that much work, and the OS X front end is due for a full rewrite anyway.
This would be an excellent opportunity to contribute that doesn't require any 68K or classic Mac knowledge.
I dont have a machine that I can run Linux Framebuffer on, I'd be better of building it on my G4, to asking a friend to compile it for me, so I can run it under mojave
In that case, 10.4 and 10.5 are options. There's also a front end that works in classic Mac OS, which a G4 is fast enough to run usably. It's not in the HOWTO yet, but I can add it.
It's nice to see such interest in my humble project. :-)