Interesting... I may try something similar on my XLV. I think that I can rig up one of my original rear sacs (a 250) in one side of the bow. Since the XLV has a deeper floor, I should be able to just fit its extra "burping" top valve nearest the bow to the intake of the 250 -- and just leave it like that. It should flow back out right through the center sac, using the same hose and with no drain pump.

I don't think that I want to have the drain set up on the other side... right by the electrical stuff. I don't trust my own ability to put together something that will reliably be water-tight. I'd probably end up with the drain pump spraying water all over whatever will be most expensively damaged by it, or perhaps just when I need a boat failure the least (boat full of women, upwind of rocks).