I'd love to hear peoples experiences on this as well. I saw a clip of the maui guys saying they paddle with their board upside down with the mast butted up against their shoulder, but this was for SUP foiling with a paddle, not while dragging a wind wing behind you as well.
The method that comes to mind is to kneel on the board and use the wing to power you over the breakers, but my local area is too shallow - my problem is that I can't flip the board over as its too shallow for the majority of the breakers, which means I can't have the foil down to kneel on the board.
I live in fear of the shorebreak flipping the board over so the foil tumbles over onto the wind wing