Thought I’d post a couple shots of my prune plum grafted to Nanking cherry- here it is at about 10 years old with its first decent fruit load. You’ll see the deer have been helping with pruning, but not a great deal.
The logic in the graft was two-fold: we wanted a prune that didn’t sucker and which didn’t get too big. So far so good- but it took forever to mature! It’s brother on its own roots took just as long, however
There’s more on the subject here: The ongoing saga of the prune on nanking cherry