You should be able to bring them back to the correct shape. In fact, I would say get repair 'em and put the money you saved toward your next set of sails. Both my rudders and my boards have had quite a bit done to them, and really, it's the least of my worries!
You might lose speed, but does it really matter, who knows?
If you're like me, you'll lose a lot more boat lengths picking the wrong side of the course or blowing your tacks.
Sail fast,
Tim J.