Yeah, Boney said it'd be possible to do a spell that made people not notice that you didn't have subconscious cultural cues, because it's both directly Ulgu-y and also Xeno-affinity-y.
And that was before we had Polyglot, so presumably that would help a lot.
Edit: Presumably that could include Skaven not noticing you lacked the usual tail-gesticulations or scents or whatever. I wrote an omake on that, though it got a bit out of hand.
I wonder if we could use that, plus the Night Prowler, plus a good disguise to sneak in some Skaven cities. Not sure why we would do so, (to buy books maybe? To meet Eshin Friend again?) But I'm curious if it would be possible.