There are plenty of possibilities in creating a good nebari!
It will take some time, but all good things take time.
You didn’t mention the type of tree you are working. Anyway... Study up the best methods to making cuttings for this deciduous tree and get some started this year. Given good growth you may be able to use them next year or the following to do approach (in arch) grafts. I’d spend some time planning out your game plan ...And studying up on grafting.
Alternatively, you could start doing grafts this year if you can locate seedlings of this tree type.
In any event, I’d look up
@MACH5 posts. He’s an expert in using grafting to create magnificent nebari.
Good luck and Cheers
DSD sends