Last year my nicely formed green Caimito which had bloomed for the first time last year broke in half four feet from the dirt.
I was ready to pull it and the advice here was to keep it and that it would recover. Recover it did, but as of today it looked like it was going to be a four foot tall Caimito bush.
So, what I did, was take two of the most vertical new green branches and tie them vertically to a stick, then to each other. After they were vertical I skinned the sides that were to touch and wrapped them tightly with grafting tape. I figure the two branches will fuse like an approach graft and once the graft takes and the new "trunk" hardens off I can cut the tops of the fused branches to let them naturally branch out and then remove (or not) the lower limbs I left as backups.
Has anyone else tried to save a trees vertical height profile like this after a catastrophic break? I figure even if one branch dies or breaks off eventually I'll have saved my tree from becoming a bush. The only thing that concerns me a bit is the "watershoot" nature of the two branches and I'm wondering if the bases of the branches may ultimately be too weak to support the weight of the tree and they both break off?
Here's a pic of what I did.

PS. Yes those are tie wraps. I've used them to repair broken / cracked branches before. they work great, but I always cut them off before the branch gets girdled by them.