Stan,
That is the 'perfect' candidate for steel pins and a slow curing "two part epoxy" as we discussed IMO.......
Fix the crack first with two or three centered horizontal pins and let it cure while clamped......leave about 1 1/2 or 2 inches extended out on each pin to fit the broken piece on........have the broken piece pre-drilled/channeled to match those steel pins.........after the crack cures solid, epoxy and clamp the broken piece in place.......Sand, finish and checker as normal....
Good Luck and Best Regards,
