I know David French is not too popular here, but I think he is right when he says this thing the schools have been caught doing is already illegal because it is against the 1st Amendment and Civil Rights Act and the schools can and should be sued right now.
I agree with French on that. But I think a bigger arrow in our quiver is homeschooling. If enough people pull their kids out of school, even for just a year, it changes the game completely. Schools with student enrollment cut in half cease to exist financially when tax money gets cut in half. Do that for just a year and it gets their attention.