Really hard combo to get a one board to do it all as the boards are really designed to do different things.
Foiling on a surf SUP to be honest sucks as a surf SUP is designed to stick to the wave and a good foil board is designed to release from the water as easy as possible.
We did make A crossover board
www.oneoceansportsaustralia.com/shop/crossover-supfoil-board and I have used them a little and even done some downwinding on them but if I had any choice at all I would not be getting a crossover and more focus on a board for each sport so you get a board that is built for the purpose it is meant for.
If you still really want a crossover just hit me up as I will do a sweet deal on some of the ones we have left.