Well your surprise raised my doubts and now I'm pretty certain they are not usually propagated from cuttings!
From
root fragments and from seed yes, but I've found few references to them growing from cuttings.
I'm gonna try it anyway.
Actually I think I'll cut the trunk down to 6", try to dig out some
roots and place a bottomless container over the stump.
I'll fill the container with
compost, and it grows back it will hopefully put roots into the compost.
I'm also hopeful it will split into multiple leaders.
If I get this, it will be like getting multiple trees.
The cuttings will get some rooting hormones and go into one of the sub-irrgated barrels.
The trunk will get rooting hormones and then it will get stuck into the ground.
If it fails , I'll pull it out and make a tool handle out of it.