Re: Dry bilges
My mast drains into shallow bilges areas that are isolated (no limber holes). I periodically check for water and then use a hose--same kind as used for my fresh water system--that is connected to my shower sump pump via a Y-valve.
It isn't automated, but it works. There is no convenient way to run a hose to a drain in the head, so I live with the manual process. As the water goes down and the hose is sucking air, it is a simple matter to put your finger over the hose and lift it up high enough to drain the last bit of water in the hose. The remaining water in the slack bilge area can be wiped dry with a sponge or paper towel, but I let it air-dry.