Yes. You can either change or cut down your keel
Several C-320s have changed between fins and wings (Some one way, some the other), at least one C-380 has done the same, so you should be able to change your keel from a fin to a wing.As an alternative, Mars Metals in Ontario will custom manufacture a bulb for your boat. You let them know that you have a C-34T (or whatever), give them a tracing of your keel, they tell you where to cut the old keel off, and then you drill holes and bolt a bulb onto the shorter stub, fair the joint, and go sailing into thinner water than you could previously.I read a review on this in Practical Sailor several years ago, so apparently it works, and is probably a less expensive option than a complete keel retrofit.SteveAlchemist C-320