I've probably spent 5 or 8 days paddling a Sealution and was not even aware they had sliding seats. I take it the seat is adjustable, but doesn't stick, is that it? Take it apart and examine the locking mechanism. Seems like you should be able to figure it out. At worst it seems like you could drill the sliding parts and stick a pin through it. Only slightly less drastic than 3M-5200, but seems like you should be able to make it work.
Pull-Up Strap Handle Kit
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