This tree has great potential, I might have even cut it back even harder.
I think the best use of this material would be to create a number of deadwood features... I think I see a front in pic 2 (with some tilting/turning etc) which focuses on the live vein in the middle which has some great movement. The live tissue flanking it could be torn away to make a shari. Potentilla are a pleasure to work with. See attached scribble
There might be a better front somewhere, but try to find one that allows you to amplify the movement in the trunk by creating driftwood features.
Roelex, I know we were talking about potentilla's last year - you found a great one!
Good luck and keep us posted. In two years you can have a lovely little tree.