when we got the black kat event a lot of people didnt need the arcade to get their ancient tokens and book of dark ritual, they just spammed any level that will contain spookats, since black kats can take the place of any spookat on any level, so there no reason to worry about, some fiend gates have spookats, even i got 2 black kats when we did the Shadow Lair Snarbolax lol. and probably everyone will farm black kats on any rank mission that its in Tier3 and it have Candlestick as the first floor of the mission.
if OOO dont modify the event everyone will spam the event on any Candle Stick level so there no reason to worry about. also OOO provides the well know "prestige mission" of the event so... (well but any black kat that you encounter on the last map wouldnt drop anything since those blacks are forced to spawn).
I agree that it should be hard to get undead-themed levels, where kats live, that could be replaced with black kats.
Punkin King can spawn in any Clockworks Tunnels-style level. It doesn't have anything to do with theme. Right?