I had a similar dilemma last year then my tramp began to crack. I was doing to manually stitch it and even got a proper thread, V-138 UV-stabilized polyester thread. After re-inspecting the entire original (1988) tramp I've decided not to repair but replace the tramp. The damage comes from UV and it is distributed at the entire tramp. If I would repair the actual tear, it would just fail in another place.
Second issue with my old tramp was the UV damage to the vinyl edges. They were so much harden, no needle would penetrate. It still could be force punched, buy any repair would be just too pailful.
If you decide to repair it, you can easily stitch it yourself. The time it would take you to take off the tramp, drive to a sailmaker and back, then reinstall the tramp, you could have been done twice doing it yourself. I've done several small repairs to my old sail with V-138. Sawing is just another skill, IMO, every sailor should embrace. There are also grommet replacement kits you can get in a hardware store.