Kadie, Please, Please.............
Don't cut this tree. The one in this photo is absolutely beautiful and the character in this tree is just starting. I really believe that this tree will be a magnificent specimen one day.
Use or find a really nice bulbous based Obesum Root Stock with multiple branches and graft those.
I think that we need to graft onto a really good size Root Stock plant, then the scions grafted will balance out as they grow. I have one grafted tree and the root stock on it is nice, but the scion is of a much more aggressive or faster growing hybrid.
So many trees are grafted onto very weak looking or lack luster root stock. They never seem to be balanced.
As for what blooms to graft onto a tree. You have some very beautiful ones. I am in the same dilemma as yourself, trying to figure out which to use together.
I have some particular things that are important in my decision making.
1. Root stock already with definite size and shape.
2. If doing a multi graft, I want nice set of branching and all other small branches will be pruned off. Leaving only the branches to be grafted to.
3. I want all blooms to be of same type. (Single w Single, Dble/Triples w Dble/Triples)
4. Colors that compliment each other.
5. Performance and time of blooming. If I could choose two or three that bloomed at a close enough time to each other. This is not paramount, but a thought.
What I had done the last time I grafted. I used 3 scions from the same tree, because it is one of my favorites and I wanted to have another in case something was ever to happen to the mother plant. When I did the grafting, I left the cut branch, just a little bit longer than I usually do (1") so that if either of the grafts did not take that I could just slice off a 1/8 - 14" of the branch to try another graft union. I ended up doing this with one of the branches which did not take and the next one did take.
I am anxious to get some going.
My friend told me that it was very important that the Root Stock was in full growth when doing a graft. Scion tree also, but most importantly the root stock.