Treelore

By using stainless steel bolts or threaded rod and some soft malleable cable with picture eye hooks or small lags you may be able to screw that piece back together and support it from higher in the tree. Definitely worth a shot before removal of the limb especially with ornamentals as they are so valuable. If in time you see it is not taking, refer back to previous posts for best removal method of limb. I have had success with bracing torn limbs like this nearly 6 weeks after the tear so anything is possible.