Around here there is an outfit called Team River Runner that takes military amputees and other disabled out and teaches them kayaking. They undoubtedly have experience in how to set up disabled people in a kayak.
I have not looked into it, but I know they have a web site: www.teamriverrunner.org Check it out and good luck.
Kayak & Canoe Outriggers
URCHIN Portable Anchor
Electric Kayak Motor
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