What is being lost here is the fact that OP is asking about the best path to securing a CS major at a competitive school and not how to get out of taking intro level college calc-based Physics.
How strong is OP’s child in physics? AP Physics C is an option but I don’t know how many standard “strong” HS kids have the ability to do this as a junior and/or senior. Not every kid goes to Stanford, MIT or CalTech. Most do not and end up just fine.