Soccer – even on a club level – is a good EC for schools that like the balance of arts (music in your case), athletics and academics. Williams falls into this category and I believe it would be a good fit for you, but it’s still highly selective.
If in December you’re still open to all three options make sure you have a safety in each.
BArch at Oregon is a good suggestion. Probably a safety, but I’m not sure about OOS tuition.
I’d also look at Auburn. Excellent BArch program and no portfolio required. Also probably a safety. I believe they offer merit aid.
For BS Architecture, Virginia is very good, in a similar cohort with Tulane and WUSTL. Again, not sure about OOS tuition.
Among LACs, I’d like to mention Connecticut College which has a good BA architectural studies program and would be a match/safety for you. Need-based aid only.
http://www.conncoll.edu/academics/majors-departments-programs/academic-programs/architectural-studies/
Berkeley does have a BA Architecture which I’m sure is a great program. It may be a financial safety for you, but not an academic safety. I’m not that familiar with undergraduate architecture BAs at the other UC/CSUs.
I believe males can take courses at Scripps if they’re at Pitzer or other consortium schools. You might double check, though.
Aunts don’t count for legacy advantage.
I spent some time on the CalPoly website but didn’t get the answer I was looking for. I understand that you have to choose a major when you apply, but is the architecture (specifically the BArch) a separate choice from Environmental Design? Or is it a combined choice? If the admissions rate for the BArch program is really nearly 50% it’s a wonderful opportunity, but it just doesn’t sound right to me.