I don't have any medical advice to share, but could you use a single blade on one side and get a boat with a rudder?
Could you take up rowing? How about using a Frontrower rig in a canoe or the Hobie pedal rig?
I'd do anything to get on the water.
Hope you are feeling better soon.
EZ-Dock modular docks
Deck Rigging Gear
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