Looks like Ron came up with an even simpler solution than I was thinking of. Just block off the passage from the top of the PCV valve into the supercharger, then run a line from the PCV valve plate to the catch can, and back to a vac source. Simple and effective, as long as you don't have the intake of the system blocked.
Edit, taking another look, he actually put a hose from the top of the PCV valve to the cover, then fed the return from the catch can back to the PCV housing. Very effective, but I think the way I thought it was is simpler.
