The above type of board seems like a great idea .
Even though I'm competent at waterstarting , I still ride boards 15 litres over my body weight so I can pull start , just in case the wind drops . And that's still tricky . A freshly dunked rider and sail would be over 10 kg over body weight , add 10 kg for wet board and you end up with a board 20 litres over body weight almost sinking . If learning , and still want to pullstart you want +30 litres at least . Water starting In light wind is a technique . I'm 115 kg so I've had to adapt .In super light wind , I fly the sail with front foot just behind mast . Super bent front leg , knee at chin .Keep low with back leg stiffly pointing straight down in water . All in one motion throw rig forward and try to headbutt mast as low as I can . Throw body and beergut at the mast base keeping super low .Not so much lifting me up but sliding me sideways on to the board . Humming the Jaws theme also helps .

Sometimes when I'm tired and my 9.5 m cammed sail is on the downwind side of the board , it's just easier climbing up and pullstarting than swimming around a drowned big bastard cammed sail

I'm .not riding waves so I don't need a smaller board . One less thing I have to worry about .