Well, AF Dirtboy never did say what JCB said. I would have called JCB first to see if anything like that was available for their bucket, then Googled around for "bolt-on cutting edge", THEN hit the message boards. IMHO :confused3:
Personally, I think the gap between the teeth is too small to support a bolt-on cutting edge. That would be the part you would want to add more hard facing, not drilling more holes to weaken it.