Exeter and Andover are need blind. Also very competitive in terms of admissions. There are other schools mentioned on other threads here that may have more flexibility with international students. Overall, the combination of being international, applying for 11th, and needing FA will be a headwind. Not to say you can’t try, but understand that even with your amazing profile, nothingis guaranteed. My sense is that if you can pay 50% +, needing FA may not be as much of an issue as needing more. You’d really have to ask on a school by school basis.
If you wanted to pursue the IB (which you say you don’t, but it can be helpful in collegeadmissions, especially if youare lookingbeyondthe US.), George School offers this (and in a much more flexible format.)
I’d counsel that regardless of your application strategy, you try to figure out how to make UWC work for you. (Can you change locations - idk if that’s possible?) It has a fabulous reputation and can open many doors, probably more thanmost US boarding schools given it global reach.) Sometimes, it’s a matter of connecting with different people or finding things outside the classroom that make you happy.
You sound like a very accomplished person, and I wish you luck.