I'm pretty sure you can, though I think it will piss off the golems so beware of that. I also don't have any idea if they'll re-emerge from the eggs with the same profession. As I said, the spawn eggs in creative mode seem to only produce farmers so if MobCatcher just uses the same kind of item it may encounter the same problem.
Also, I've killed a good 20 villagers in the desert village near my place while testing this thing, and everyone seems perfectly happy to trade with me still. Most were killed while I was in creative mode, but not all.
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