I'd have to agree with Mark on this one. My future father-in-law tried out one of my kayaks back in the days before bulkheads. The boat was "so stable" we didn't bother with putting the float bags in. He somehow managed to tip it over, slipping out as it went over not even getting his head wet. My wife to be quickly rescued her dad taking him to shore while I very slowly towed the vertical kayak toward shore till it ran aground then dragging it to a more horizontal position to drain the water. In our case it couldn't have been pumped as the cockpit was not above the waterline when the boat was vertical.
Needless to say we now have bulkheads and still never leave shore without backup flotation bags inside the watertight bulkheaded compartments.
Have also seen this done with a 28' Inland E-Scow sailboat. A very slow tow to shallow water with that one. Thank goodness done with a small powerboat.
Sea Kayaker Magazine