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.
PFD's (Life Jackets)
Gedi Convertible Helmet
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