As a sailor of many years, I really can't recommend you repair a keel unless you can drill, tap and bolt the two halves of the keel together, preferably with a layer of epoxy adhesive sandwiched between the pieces.
I had a 'major chip' (About 5kg) taken out of my boat's keel, and having shotblasted both bits clean and used an araldite-type adhesive, the join had failed within 2 months.
John Smith
December 2007