Okay, I'll try that. (Dunno why the option isn't showing up on the Lot Debugger.)
Going to a community lot rerolled the empty slots.
Thanks.
(The portrait thing I mentioned? Must've been Jase's anti-aging elixir mod, because I took that out for a totally unrelated reason and the Goths' family portrait shows properly now.)
Edit: Okay. Coulda sworn I had the College Adjuster installed- guess I didn't, but I was able to add their want slots with the InSimenator. (Yes, I know, a non-awesome.) They're still rolling some blank slots, but as far as I can gather that'll stop after a while.