In case you’ve been under a rock, or perhaps on vacation, you may have missed that Toni Wilen has a proof of concept PPC emulation working on WinUAE. It’s just enough to run AmigaOS 4.1 Classic. The current PPC Emulator is not JIT, so it is rather slow – even on a fast PC, and you can’t use any of the WinUAE extensions. Also, several critical PowerPC instructions are missing, so it is prone to some crashes. Even so, it is an amazing accomplishment. It also works with PowerUP and WarpUP/WarpOS PPC apps under AmigaOS 3.9.
I gather Toni Wilen will look into getting the more advanced, QEMU PPC emulation core into WinUAE, which should provide greater compatibility and speed. Timeframe is unknown.