Have you also rejected the use of a ratchet block to ease arm fatigue?
With my Mirage Sport I use the
Ronstan Orbit Block Series 40 Ratchet (RF46102) which I think is the smallest ratchet block available anywhere. I also use a spring to keep the block standing up from the kayak deck but am probably going to replace the spring with a
Ronstan boot(RF2454) that looks like it has a little more give than a spring.
Because my Sport has a sail boom I locate the ratchet block in front of me but I don't see why the block wouldn't also work well attached at the back of the kayak.
Using a high tech ratchet block on a sailing kayak is not technology overkill: it massively reduces arm fatigue.