Well, yes, a seedling that needs to grow a lot.
I would pot on into the next size up without disturbing the roots, then once it has filled the pot go to the next size up. The reason for doing it this way is so that the soil does not stay wet and cold in the pot. I would just let it grow for a year or two, fertilising. You could put some movement into the trunk early and remove wire once it is set.
I'll do as you suggest, putting it into bigger pots.
For the time being I would not attempt at wiring it as I like the current movement of the trunk.
Hope to share a first update in 3-4 years from now…