Have you ruled out STEM Universities?
Math, science and music interest abound in Universities with a high concentration of STEM majors and they do get to participate in musical organizations without electing a music major.
By way of example, see music activity at WPI @ https://www.wpi.edu/news/infusing-stem-music and courses at @ https://web.wpi.edu/academics/catalogs/ugrad/mucourses.html. These are music minors which also can offer tutorial performance minors.
See “Musical kids at WPI” thread.