With only one hand, it might be worth considering taking the stone in-hand, with the blade in a fixed support. Support or clamp the knife in a fixed position, and use the stone to work both sides.
The video below sort of hints at how this might be done, using stones affixed to paddles, which affords better control and helps keep the fingers clear as well. In this example, the sharpener is using both of his hands. But it's not hard to see how the same might be done with the blade securely supported by a clamp or vise.
Another possibility, is to use a V-crock style setup with stones/hones angled on each side, such as the Sharpmaker or a similar tool. Affix the sharpening rig securely to the table or bench, so it can't move. Then just draw the blade along the inside edges of the 'V', keeping the spine vertical as you do so. For touch-up or light maintenance sharpening, this method would likely be the simplest, with a lot of market options available to do it.
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