The hard parts would be to get a way of measuring the thing you want to control, and then an actuator that can effect it. Fundamentally, what you're trying to do is no harder than trying to stabilise a helicopter and a gyro-based feedback system should be fine.
Do you actually need an electronic control system, though? Early hydrofoils just used a leading foil which flew on the surface and trimmed the lift foil. Can't you use something like that - in other words make the system inherently stable in each mode?