E-UAE on a tight Linux distribution should work, albeit more slowly than on a modern G5.
It's been said by the man himself that the only hurdles to open sourcing Amithlon and his early work on a PPC JIT are serious involvement by a talented programmer and probable drama courtesy of Harald Frank.
Did Petunia ever make it into the wild, or has it been locked into OS4?
Aside: You have to wonder how much of the drama in the Amiga world started out with slight cultural differences, misunderstandings, and misinterpretations. Everything from sarcasm to the definition of intellectual property varies wildly from society to society.