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Thanks for the pointer, I've never heard of these. You have in mind something like this, right?
At $20, it's pretty cheap insurance, I think I'll order 2.
My thinking was
+1 for manual bilge pump, all my kayaks are equipped with those (none of my boats are for scuba though).
A paddle float is another great item to have, it will assist with reboarding and also lets you use your paddle as an outrigger for stability (paddle float extended out 90 degrees and other end of paddle under your butt or lashed to deck bungee).
I had a longer post I can’t get to publish. For me every time I get In my kayak a PFD, paddle float, and bilge pump are minimum safety gear