If these are public schools, have you looked into state policies for gifted students? Our school district was just found to be out of compliance with state policy following a complaint filed by a group of district parents. It is hoped that this ruling will have significant implications in our district (although in my experience, the "box" advocates, on an individual basis, have very deeply held beliefs that will not be swayed by this ruling).

If other options have run out, this sort of complaint is a strategy others may want to consider.