My son gets back on the tramp this way. I've rolled a friends H16 a few times with him on board and on more than one occasion he has come out of the entire situation dry. He will stand on the lower hull right in front of the main beam. As the boat comes over, he grabs the mast and rolls over. I don't think you could do this by yourself though... you'd have to be pretty quick or have a lot of wind helping you right the boat.

-Rob V.
Nacra 5.2
Panama City