Unfortunately, the teacher in the article H posted earlier tried that and it didn’t work. Also, if you go by last names to instill formality and discipline, if you just say their last name it’ll come across strangely obvious why you’re doing that. If you go by Mr. and Ms. (last name), you’re still not avoiding a gender reference. The liberals are going to counter that you’re “dead-naming” the child, an actual “trans” term.
I told my wife about all this today. She told me the hospital where she works does annual “reviews,” in which one question is “If a coworker identifies as transgender, are you willing to refer to them by their gender and name of choice?”