Not with MUS, but my oldest son really needed to skip over some of the Pre-Algebra in his text b/c so much of it was review for him. We use a combination of Math on the Level along with Saxon 8/7 last year, which has a lot of Pre-Algebra in it. The year prior he worked through Life of Fred Pre-Alebra 1 as a supplement to our MOTL lessons.
I’m not sure how MUS is set up but if you already have the Pre-Algebra perhaps you could just go through it and skip what your DC has mastered.
I think Pre-Algebra on the whole is very important, but I do think from a lot of what I’ve seen it does have a lot of built-in review.