Larry, I believe it can be done
The cost is the question. If you have your old sail you could attempt it. Most sail makers cut panel then sew them together. If you look closely at the seam lap, you will see the as you move to the luff from the leech of the sail, the seam will get wider. This is how shape is incorporated into the sail. Some panels also taper to the leech. The sailmaker would most likely attack your sail from the leech edge. Removing the leech line and the binding on the leech. (it may be bound by a seperate piece or the sail panel is folded over to create a pocket for the leechline)The cut will affect the batten pockets. They will be removed ( they can be reused after the sail is cut. The sail will then be faired and cut with a roach. The leech pocket redone and the batten pockets reinstalled. The headboard reinforcement sewn on and the headboard reattached. If you were going to attempt this yourself, I would buy the videos on SailRite before touching your sail. The other option would be to have a sail maker look at it and if he/she would let you, have you remove everything to save a few bucks. That way all they have to do is cut and sew.I am going to rework an over size main this winter for my boat. good luck r.w.landau