Mars Metals are the folks to ask. They can fabricate a bulb that will correct your loss or righting moment, but as others have said you are also losing the foil and that has to affect your pointing ability. The folks at Mars might be able to tell you how to check on that, or recommend a naval architect who could run some numbers to give you a better idea.
If you really want to get into shoals...it might be better to look at selling the boat and getting a centerboard boat instead.
Also bear in mind, once you circumsize your keel, the resale value of your boat may also get chopped down.