Anything is possible but it looks like the keel has been welded to the plates - it's weird but looks like spot-welds (?) - so the only way to drop the keel now is to cut the plates. I think I will follow up on Captamyhem's idea and give Hunter a shout to see if they have any records of this or if anyone there can shed some light. At this point it's only to satisfy curiosity though .Perhaps a stab in a very dark place, but the plates were added to the keel to assist in relocating it. The plates were added the bolts were loosened and the keel was separated from the stub for resealing the plates acted as guides to help support the keel while the Keel to hull joint was being cleaned and new sealant applied. Just my guess.