I just remembered it is in fact a sand cherry, prunus besseyi. I consider them bush cherries since they are a bush but not sure if that is the standard use of terminology. They are related to the other bush types but not sure how much help on grafting compatibility it would be.
The base is under snow now and it’s 7F here so sorry no picture …
I would just do a few test grafts if nobody here has any more experience to report.
Oh it looks like there was a past thread here on this topic:
Looks like it has worked for some people.