Three solutions:
1) Either get yourself an old Wintel machine (2+ GHz practically free) and run UAE on top of Windoze or Linux - you don't have to look at the host OS if you don't want to. Hey, what's so bad about UAE? You're emulating anyway.
2) Get yourself a '1200 on a card' and plug it next to your RTG card. There's none available you say? Guess what, seems it's not that easy... (Still waiting for a Minimig or Natami on PCI/PCIe though.)
3) Keep phantasizing about emulation, VMware and such until you drop dead. Can't be done that way. Read a book on 68k assembly, learn a bit and start coding. See? Can't be done.
NB: VMware really is a bit like what Shapeshifter did. They both provide the environment (a virtual machine) for running an 'alien' (more or less) OS on top of a guest OS. Shapeshifter could do it as MacOS software was so extremely system friendly that it "just" needed to modify the system drivers to use Amiga hardware instead. VMware in combination with current CPU features creates a
complete virtual hardware with fully functional MMU etc so
any OS runs on top of it (I'm not sure, but I think you can run an ESXi on top of an ESXi - I need to try that one day!). But this is no wizardry either - just look at the hard time they're having when it comes to proper GPU support.
