lasso cables are made for this, but more expecting you to be on a roof rack or similar.
Some boats have lock points, often just behind the seat. With these, you can just use a standard lock and cable.
Thieves are looking for easy prey. Seems that if you make it harder/more expensive for them to resell, that would also slow them down. So lock through the deck lines/bungees would require that they untie them or cut them, either way increasing the work they have to do to sell. If you have a rudder, locking around the control cables would have a similar affect.
Taking off removable parts, like hatch covers, and storing separate from the boat also would decrease the value to the thief (but increase the chance of some critter turning hatches into homes).
URCHIN Portable Anchor
Kayak Motor Kit
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