Yes I’d agree with Butler and Indiana for classical ballet. Oklahoma and Utah usually come next. USC (SoCal) is very strong but not as classical. Not sure about double majoring, but I think USC is feasible, Utah and Oklahoma are definitely fine, but Indiana isn’t. Not sure about Butler.
Of the three above, I don’t know Duke, but JHU is inconveniently organized as Peabody is a separate site and may restrict participation in performances to their own BFAs. As far as Stanford goes. @SCMHAALUM ’s S went there in 2018, but last I heard (pre-Covid) the standard on campus wasn’t really up to his previous experience and it’s too far to go to SF for outside training. Not sure if they were able to solve that.