Hornbeam Reverse Taper Correction

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Piedmont NC
I harvested a hornbeam from a wooded area this past spring. It is thriving well with lots of leaves and new growth. It is only 10" high and has a fairly nice and interesting trunk.

The issue is that at soil level the trunk is smaller than it is about 1" higher up. I think a good cure would be to air layer or ground layer, I guess you would call it.

Cut the bark away at the proper level and just put it in a deeper pot for a year or two and start a new root system at the larger diameter of the trunk.

When is a good time to do that? Since I have a thriving tree and root system can it be done most any time or should I wait till bud break next spring?
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