Well, one good explanation for why it would likely not work from a fellow member on another forum:

"Feeding a receiver's or pre-pro's video switch backwards would not work, as the signal is buffered (basically passing through a pre-amp of sorts). Now if you use a mechanical signal switcher (like the ones you get at Radio Shack) that should work just fine, since they're just switches, no buffering or amplification is taking place.

So in short, if switching mechanically, it'll work, if electronically, it won't."

I guess a definitive answer would have to come from an Outlaw tech.

BB