I have the same issue. I ran electrical and air line to the garage from the basement, but didn’t put in 220/221 before I finished the basement. Now I want it up there for a welder. Contemplating the same thing myself. I might have a way to get there wihtout knocking out drywall, but it won’t be easy. I don’t have a fab project right now so it’s not a priority.
I’ll ask a buddy that is a builder if he knows someone.