Actually, I've toyed with doing something less overt: I've written a scene with Uhura--where she reports to her communications station--and the first thing she does before sitting down to work is she takes out a lint roller and picks up all the cat fur and dander that M'Ress has shed all over the chair and console. So we might hint at M'Ress instead of actually seeing her. (Maybe it'll become one of those running gags--where everyone talks about her, but we never actually see her.)
OK, this is HYSTERICAL.
Love the idea.
Oh and my friend did this for the Las Vegas STar Trek Con: