One might also find things like MQ-8C useful in a sea control capacity, on ESM duty if nothing else, and those would likely fit, unmodified and assembled, on the vehicle decks. I doubt they'd be useful enough to include in a purpose-designed ASW helicarrier, but that's not really what we're talking about...
I think the real gain would be in spares, shops, and the like. Possibly even modularized helo payloads, like a tiny mutant CH-54
,
if you REALLY want to be crazy.