If put you a whole PowerUP card on an FPGA then OS4.x and older versions of MorphOS would run on it.
im not so sure. there is apparently so much trouble to properly configure winuae to even run os4 that one needs either multiple pages of manual or a special application to get it right. who knows all the quirks and how such "fake" hardware would behave. what concerns morphos i have never got it to run on my apparently perfectly supported setup.
and now, what the point of this whole discussion if a sloution even if possible would only prove one point, namely that it was too complecated and unnecessary.
what strikes me about a number of posters on amiga-like sites, is that they have some fraudian problem. they dont accept what is availeble for them. they demand the impossible. as example they want amiga os on x86, but they dont want aros, which is what it could effectivly be, best case. or they dont want to run os4 on dedicated hardware, they want to run it on something completely inappropriate.