Do not comply. What will they do if hundreds of thousands of children simply don’t get it?
Shut the schools down for a long as it takes.
For starters, harass and intimidate. Child Protective Racket intervention. Truancy violations. Court actions.
Much depends on the political atmosphere of the community. However, if I had kids in public school (which I never shall), I'd leapfrog those hassles and get right down to brass tacks: simply inform them they'd not be getting their $10k/year (or whatever) from the govt for any of my babies.
Forced vax, sex ed, privacy-violating questionnaires, predatory teachers, CRT if any history at all, LBGTxyz celebrations & trannies in girls' sports...How much more deleterious does public school have to be before parents do what's best for their kids?