Sorry. You cannot make the OS 64 bit compatible. It needs tons of work. The entire API needs a rework, as structures are currently out in the open and with all these 32 bit pointers those structures are also in every compiled application.

Most ppc software is available in C and open source anyway, so a recompile plus a few fixes should do. Only applications hacking in structures need massive changes.

So after making all changes to improve and add ALL the features, the OS can be used with UAE to get 68k stuff running. I personally only use one single 68k application, so I would not care beside of playing some old games.

I would rather drop all ends and go all in for modern stuff, than hack stuff together to get barely working stuff and don’t think we need PPC emulation at all.