My older two kids have done gap year teaching, on separate continents, & been addressed as Teacher Name, or T (pronounced 'tee') Name.
So it would be 'Teacher Fred, can I go to the toilet?' or 'Tee Ginny, I've forgotten my homework.'
This struck me as eminently sensible. Nicely respectful, inclusive of all, & no confusion over honorifics & teachers with a gender agenda have it quietly rendered irrelevant.
One might wonder why the genderists have not suggested such an approach, rather than getting all Mx-y about it...