Brad, I don't think there's any need to trick anybody. Look in the Windows Mixer, and if you can see separate USB sound card/devices there, you can use MC's multizone system to let 'er rip!
Yap did not have separate devices, as far as the OS was concerned. Apparently VAC was able to provide virtual identities to the OS so he could create MC zones for them. For me, VAC only encouraged befuddlement.
One note: I tried this back in prehistoric times (without VAC) and it required the cards to be of differing models, otherwise windows could not differentiate between, say, two separate Audigy NX's. Hopefully that's changed.
If in fact you can see separate devices, you are off to the races. There is pretty much no limit to what MC can do for multiple zones. It's almost spooky. Try posting to the main forum, to attract the likes of "Mastiff", "Glynor" and "Alex B", among others.