I've been working on a KoHo since 2007 (I actually bought it from Chuchin, a member of this forum).
My experience is they backbud, but not as reliably as say, a maple. Especially on old wood.
So I've done lots of thread grafting to save time and make sure the branches will be where I want them to be. In the pic below there is a thread graft in progress plus the next two on the right are older thread grafts.
Your tree has excellent potential. The main issue I see is there is a disconnect between the lovely taper of the older trunk, and the tall apex. If it were my tree, I would reduce that long taperless apex quite dramatically. Probably by 75% or so. I think in the virtual you showed, the apex reduction is not enough. I would definitely cut back to an existing bud to be safe. Then thread graft if necessary. If there is no existing bud where you want it, thread graft first then cut back later. They can be threadgrafted both prior to bud break and in the early summer using a defoliated branch.
Compacting your tree is a long term project but I think it is worth the effort. My tree is undergoing a similar procedure. Here we are seven years in, and still a long way to go. But its been fun.
Best of luck, and take everything I am suggesting with a grain of salt. Enjoy your tree.