What religion prohibits from reading the tags, again?..
You know what? That's actually a valid point. Should've thought about that.
(Still blame assholes who can't do tags correctly)
Anyway, description and premise indicates rather clearly that it's women only. And I'd say we can all agree that fully transitioned women would be irrelevant here due to being non-distinguishable from cis-women.
Fully transitioned at the age of the students under the circumstances of their admission seems extremely unlikely. And if it happens due to Discord voting, so be it, but the best plot-based fit would be Donna, and reaction would be ... mixed? In the dystopia presented, hard to see anyone in all the trouble not-Priti is in AND transition getting Mycock's vote.