I'd look for rooting suckers, if your friend allows, best is to open a larger hole on a clear cup, so you see when roots emerge, and thread the new sucker through the hole, fill the cup with soil, any soil, even dirt from around the tree, and let it sit there for a while.... when you return, the cup should be full or roots, all you have to do is to cut it away from the mother tree and you will have a new tree with no fuss of rooting the cutting. I have several going on around my tree now, some are pretty ready to be severed. Much easier this way and no gnat worry.