Hell, play your way. It's sounding good that matters. With guitar, I've seen all sorts of weird fretting technique, all sorts of ways of holding picks (or not holding picks), people with missing fingers... I don't understand this opposition with violinists at all because it's not even about using the different technique, it's using the exact same technique in a mirror image. In fact, I'd argue that this prejudice is even worse than with writing, because kids learn to write when they're young and can more easily adapt to using their unnatural hand. But if people have been lefties for years, it would be way worse to make them change to play an instrument (although I understand that it's different in your case). Hell, I can barely hit a ball with the racquet in my left hand. I agree that the orchestra argument is the only valid one, but you could easily do trio and quartet stuff.