I'm not saying that it's a good choice, but just so you know: it _is_ possible to compile a PPC binary with PearPC and then build an Intel binary on OS X running VMWare. (If you google around you'll find hints for how to run OS X on VMWare.) Then you can create a universal binary on the VMWare machine.
It's a slow and inefficient process, though, and not legal. And transferring files between the different virtual machines isn't always trivial.
It's a slow and inefficient process, though, and not legal. And transferring files between the different virtual machines isn't always trivial.