The only one I know of is Vladimir (he is French, not Russian) in Shelter Bay Marina. They have just opened a new sail loft and have a big floor and table with large sewing machines. I just had him do a modification and repair on our sail cover
and it was a superb job. Like all things associated with Shelter Bay, it was expensive.
I also discussed some major modifications to our mainsail
and came away with the impression that he really knows what he is doing and understands sails
and their construction.
There is also supposed to be a guy in Puerto Linton, but I have never been able to make contact with him.