Only half way through my first coffee this morning so I hope this idea will still seem plausible as I wake up. I am picturing an efoil that uses drone stabilization. Four smaller motors and ducted props; each motor mounted on one of the four wing tips.
For take off, the props are thrusting downward and the craft is stabilizing with the help of gyros and accelerometers. The board can be very small since ii is not used for take-off lift, just big enough for the rider and batteries and electric stuff.
In cruise mode, the rear thrusters are mounted a bit higher as shown so that the thrust system can add some pitch stability in forward mode.
Higher power is needed momentarily for the vertical take-off.