James, would you be willing to send scions or seeds? I have Sweet Scarlet that I will prune in a couple weeks and can trade. They
root readily as cuttings, I would not bother grafting. I second what others on here have said, that seems unlikely to work well.
I take a 12" section, fresh trimmed at the base, dip in rooting hormone and stick in the soil. Seems like most years it's best to root them towards mid-spring. This year I am doing softwood cuttings as well, since I am planting a couple hundred and it will more than pay for the setup I need. The
chickens eat nothing but goumis for weeks when they are in.