If you rig a trap handle on a trap wire low enough to grab hold of with both hands at a comfortable stretch from the water you can hook both your legs over your bow near the beam, then use both arms to hold your weight and your legs to pull you up to get your backside on the beam then roll sideways over the main beam with a bit of help from your arms. This is only a lift of 2ft from the water. The wire with a handle could even run straight down your mast as long as it doesn't foul your jib