That would work great but I'm not sure how I would put it on the boat. There is a plate on the boat and one on the base of the mast that fit together when the mast is up. I have pics but can't seem to post them.
Could I attach stand up blocks to the deck right next to the mast plate I have?
Not familiar with the S2 you have, but it sounds like you have a hinged maststep which allows for easy raising and lowering the mast. If so, you could put the plate mentioned earlier beneath the existing plate on the deck. Just have to lower the mast, pull the pin to release the plates, unscrew the plate from the deck, copy and drill the hole pattern to the new plate, remount the new plate and old deck plate, then raise the mast.
The mast plate is probably the best way to approach your problem. But standup blocks with proper backing plates would probably also work ok on a boat this size. It's just more holes in the deck.