Are there branches low on the tree, if so consider taking the tree down in thirds.
Take the first third now and graft on to regrowth, take the next third late in the season about harvest time and take the last third next year. Or just take a third each year. I have found out in my experience that grafts on a tree done this way grow faster than those on a tree cut to a stump.
I don't know if others have experienced this.
For me, future topwork will happen in increments.
Alright I found a couple low branches and cut them back some, hopefully they grow new growth from here.
The reason I wanted to cut it down so far was so I can start the branching closer to the ground. But we will see what happens. This way I can graft onto it this year instead of having to wait until next year most likely.