A thought I have is to see about getting a good pump company to make one of these but with a great improvement in quality and power. If Anna (my wife) can get some time, I may pet her on the project. She's a design engineer and can get most of the sub-assemblies through her professional confections.
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So it could be used like the manual bilge pumps and un-lashed from the deck bungees when needed, but it could be dropped in the cockpit and turned on so it would pump at the same time a person is doing their reentry.
The entry tube could be only 2-3 inches long and the exit tube should be made of pliable rubber or plastic, good to very cold temps. It needs to reach outside the cockpit on any boat, and at any practical angle, so I'd make it 3 feet long. If the buyer needs less he can cut off what he doesn't need. The housing and switch should be made like a scuba light. Such lights exist now and are good to deep water pressures and work fine.
The pump needs to move a lot of water fast. I am thinking of a battery pack using 6 nine-volt batteries to power a pump using 1" I.D. bores, and moving about 40 gallons a minute. Most the sub-assemblies are made now, but no one is putting them together in the way kayakers need. Batteries need to be kept fresh, but they don't go dead very fast if you don't use them a lot. You'd only use the pump at times when it's needed, and even keeping extra batteries in your kit is not a big deal. Just something you'd need to keep in mind.
With such a pump no modification to the kayak are needed at all, and no wiring to fuss with at all. When needed, slip it behind your back-band or seat back and turn it on. At 40 Gal Per Minutes most of the kayaks we use now would be down to "sponge depth" in 60 seconds or less. A very large cockpit that was as swamped as it can get would still be close to empty in less than 2 minutes.
I need to find out what it will cost to get all the sub-assemblies and I may end up machining a few of the caps and/or battery housing myself, but if such a pump can be made and sold for under $200 I am betting a LOT of kayakers would want one. If it existed now, I'd pay that much to get one.
If you capsize it's nearly always in rough water so hand pumping means you can't be using your paddle at the same time. A hand-free pump would be a very nice thing to have in such situations but the one I want to make needs no holes drilled, no wires run, no problems with the switch and no issuers with placement.
