Yep, the only viable solution to put OS4 in the hands of the teaming masses of Amiga users (we'll maybe not teaming masses,but...) is to have it run on PPC Mac hardware, I just cycled out 15 PPC Macs at work, replacing them with Intels. We''ll dump those PPC Mac cheaply. There's at least a dozen more I'll be taking out of service this calendar year.
There's a glut of PPC Macs on the market. Here in Australia no one have ever been charged with running legally purchased software on non-Eula allowed equipment. I don't think they could be charged under current Australian law. You bought the software, you bought the hardware, it's nobodies business what you do with them.
If you can buy a highend "Amiga" (ppc mac) and os4 for less than $400 who's the loser? Nobody, Amiga inc (KMOS) does not and never has produced hardware. Same with Hyperion.