Oh man. I really loved the Middlesex writing program but I think that’s out for math. You’d need to check with them if admitted. Specifically you need to speak to the head of the math department, NOT just a teacher. They are surprisingly rigid about math track, I cannot quite recall the detail as it was a while ago, they insisted kids take alg2 or precalc even if kids were beyond that. So I guess if it’s precalc it would work but if it’s alg2 it wouldn’t. However, because I loved the writing program so much I did ask about writing at other schools. Honestly many “emphasize writing” in some way.
Let us know after m10 and we can maybe help with specifics.