admire your courage
the top half of your tree looks like some very good variety, I would’ve tried to do something to save it for example air layering. The variety of your lower part is unknown.
Yes i had thought about it for awhile could have been a good learning tree for some air layering. But while I was letting the trunk get thicker over the years and listening to others about having a back up plan with the flawed tapper I wanted to get the next phase stared ASAP. Thanks for the reply I hope it does recover.