Andy, I have done a successful stent graft, mostly as an experiment. It has been a few years, but I believe I used Swingle as the rootstock and Satsuma as the scion. At the time I tried it two ways. I removed the rootstock to be rooted, from a plant that was slipping, and budded it after seperation. I also budded a few while the rootstock was still on the mother plant, and rooted the budded stock after the bud took (this might be considered cheating). I know I had some success, but I am not sure how much. In most cases, it is a lot better to simply bud a seedling.
Ned