I agree that they would probably mess up the Buco’s you mentioned if shortened by the wrist.Hello D! Truly, I have not asked Dena if she would do such job. I was thinking in practicing with a sacrificial jacket, but I have not got around to it. I know my friend was able to doit. He did for the fly boys and bikes when He worked at the San Diego leather jacket company. He is now too old and sold his trusted cylinder bed lockstitch walking foot sewing machine. However, he did tell me that I did not need that particular machine. My trusted Consew 225 or 206rb-2 can doit. I also know for a fact that LW machinist can doit for about 2k. I have read some members had panels removed with pristine results.
The shortening from the shoulder method is the optimum way of shortening the sleeves but the jacket cut must blend itself for it. Personally, I am fine with the Vanson/Schott method of shortening the sleeves at the wrist. But jackets like the Buco j21-24 have that special stitching three inches from the end of the sleeve that creates a challenge. For this reason, the shoulder method works best for those jackets.