Skipin,
Probably best to send through a photo, if you are able to.
I am getting from your post that you want to graft a piece of a branch to the side of the caudex to make the plant have branches evenly on it?
This possibly could be done, but it leaves so many different possibilities, with being able to visualize it, it makes it difficult.
It may just need pruning, bud grafting, etc.
Rick