Thanks for the ideas.
I guess I only have a problem at this time of year when I'm using big sails in light wind.
I do try to gybe in shallow water where possible and I wear an impact vest which is floaty but maybe not as much as a true flotation vest.
Lifting the sail from the tip doesn't work in chop for me, but good in flat water.
The boom is too high to sit on the tail of the board.
Terminal's ideas using a combination of board bouyancy and arms sound useful.
Is 4' above the boom four feet?
I find Steve's idea that old booms fill with water and tend to lock the clew into the water makes a lot of sense. I used to have that problem a lot, but rarely now that I have a new foam cored boom. And I thought I was just getting better at waterstarting.