Fixing a wrong transpose

I got a job fixing a transpose someone did wrong. The score SOUNDED right, but they had the wrong key signature to start with, and naturally a lot of enharmonic misspellings that made the score hell to read accidental-wise, and a large number of the intervals were really wonky. Now that I FIXED it, it suddenly strikes me that there might be some short cut or some kind of AI that can just do this, because that was not fun to change almost every G# to what it should have been (Ab in the key of Eb) Is there?