During the repair, see if your watchsmith can install the newer anti-jam day/date advancing wheels. Not even the gen ETA 7750 features these; only the newer A7750s have them. I have a small stockpile from dead movements.
Do you have a pic of what the newer anti-jam wheel looks like, compared to an old one? I've got a couple of crippled Asian 7750s and would like to see if they have them ..