I don't have help to offer, but I do encourage you to save and use the plum. I recently got most of a dead plum, since I live in the Mojave Desert it was nearly dry. While most of the center of the main trunk is punky, the outside few inches, and some good branches have yielded beautiful wood. The attached picture shows an example from one of the branches, about a 5 or 6 inch diameter one. I used three flitch cut boards, bookmatched to cover a speaker ( finally replacing the missing original glass top).