You could gybe the same way you gybe the pole on small dinghies. Bungie pole return system alongside the boom and you are done. Takes a little practice and momentary low angles to bring the chute around, but it's done all the time.
However, I don't think a cat is the place for a sym chute. I don't think you will be able to get low enough (without a huge degree of apparent wind) to really use the sail like it wants to be used. What you gain with the sym chute, you loose by your main not being about to sail that low.