CMU will also let you do a true double degree, but they don’t make it easy.
At UMich, dual degrees are easier from a campus perspective if the second one is in engineering - which is also on North Campus. My D has only had one class/semester on Central Campus so far. Of course scheduling engineering labs around orchestra rehearsals is another story…
JHU/Peabody also requires a bus ride between campuses.
I totally agree on checking support levels with specific studios/professors - it can vary tremendously.