My thought is that what classical and blues/rock have in common are fundamental patterns - scales/chords/arpeggios. In most blues/rock you probably wouldn't even have to learn every key.I haven't seen the blues or pentatonic scales given anything but brief mention in classical studies, though they're very useful in blues/rock. I did have a jazz teacher briefly, and he started me out on 12 bar blues... Then jazz goes beyond what blues requires.I'm not entirely sure what you mean with not doing classical to performance level - does this mean you're not concerned with learning more intermediate-advanced pieces?
I would love to learn advanced pieces but i know i would never be able to get them down good enough to be performed (professionally), which is fine for me those pieces i would just play at home content even though they aren't perfect, i'm not looking to be perfect. I would just like to one day be able to jam on stage in a group or with friends. That is why i would be looking for a teacher to go over rock/blues as well. I guess i will just have to ask around locally, i just wasn't sure if it was a lot to ask for out of a teacher.