You can graft a new leader or drastically prune it and hope it buds where you need it. I was in a similar situation awhile back and what I did really helped the circumstances.
In order to encourage my Chinese Quince to bud, I cut a notch into the trunk . Everything on top would be going and the sprouts under the cut were then selected from. Here's an example sketch of what I'm talking about, the green are to represent the new shoots, the red shows where the cut was made. I found it enough to stress my tree (different than yours) to back bud, and the tree has used the top to better sustain itself after such an invasive procedure. Later I went back and made a new clean cut across to my selected leader.