Sending this direct also. after good luck, I later became unable to post to
Nafex.
Plums are related to cherries.
This family is difficult to graft or air layer etc.
As I understand it, moist moss, a layer of plastic, a light blocking layer,
a way to remoisten the moss, and all things plus a year are required along
with luck.
Do it again... minding every tiny nuance.