I tried the same thing on a different boat... the foot length is criticle on a boomless and I had the sail recut. It was expensive by the time I figured the sail work, cost of the sail, battens, ect. and it just did not work that great, Reffing with the hook style halyard did not work that well either.

In the end, I would have been much better off looking for a used correct main or contacting someone like Super Sail Makers and starting new.

If you are going to keep the boat for a while, new would be the best value IMO.