This might possibly work:
I installed this in two wooden sea kayaks I built and found it to be pretty comfortable. The seating surface is only a couple of inches high, but it could probably be blocked up higher with some minicell or Ethafoam. A length of nylon cord runs through the seat back and would require mounting a small inchworm anchor on one gunwale and a jam cleat on the other to support the backrest and allow its angle to be adjusted.
You might just fashion a seat cushion out of some minicell and shape it to fit. A kayak back band could be mounted for back support. Or you could check with Joe Moore at Placid Boatworks about his pedestals and back bands.
The Kayak Wing
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