I seem to remember someone making an automatic inflatable bag for the mastheads of boats that won't self-right.. much like the inflatable collars many of us wear these days.
Put the mast in the water, the bag deploys and prevents turtleing.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"