I see they offer a spray skirt for the Sea Wind at the builders web site. $475 seems excessive but maybe you could find a regular kayak cover to fit?
A little modification you could add a hole to snake out a bilge hose.

Not sure about hooking to 12 volt battery? What happens if you fill to the point battery is under water?
I know they make small portable bilge pumps for little fishing boats that run off D-cell batteries that are in a waterproof case. As soon as float raises, pump turns on then shuts off when float drops. A automatic system on the cheap.

If you took up all extra space after gear, say by adding floatation bags fore/aft and had a power bilge pump, you could at least have a margin of safety if the weather changed faster than you could get out of, or a rogue wave washed over your boat.

Boat can't fill with water if there's limited space for it. Worse case you get wet but stay floating until bilge pump kicks in.

Lot's of room to experiment and maybe find that level of comfort needed if you attempt a solo trip.