I had a Kingfisher 26. Those steel keels were its Achilles (k)heel. I eventually filled them with lube oil and plugged the filler, suction and breather pipes. Those pipes piercing the GRP hull remained a slight source of leakage, although I never doubted the 20 1/2" stainless bolts that attached each keel to the hull. If Yeong's keels can be patched, I don't think they will drop off. Keeping those keels painted was a pain: since they were bolted to a GRP hull, shot blasting them was out of the question.
PS I now remember I didn't plug all 3 pipes. I fitted a hose to the breather. Had I not done this, the sun would have heated the oil while hauled out, causing expansion and rupture. Even with the hose led up to the deckhead, oil sometimes overflowed.