Joe: Although everyone will agree that what is being done is incorrect, your suggestion will only hurt your cause. Ezehu Chacham HaRoeh Es Hanolad.
I would suggest a Kosher Mezzuza, and you go “help” them put it up properly so that the party can get a Mitzva. As we know, Mitzva Goreres Mitzva, so that could start the path.