Another option is to modify your current keel. This is done over here in the States by cutting the keel off, usually with a chain saw, and then attaching a lead bulb to each side. MarsKeels produces the bulbs. They also produce new keels, if you were interested in that route. A shorter keel will probably have more weight and be wider, sacrificing some sailing performance to gain a shallower profile.
Jake
2004 Bav 44