Have you considered making a non-depowerable fixed bridle foil kite? I like the additional power from my land only foils with fixed bridles.
Also, FlySplit boards join without screws and only use pins which is much faster and no tools are needed - I don't think this has ever been done before. This makes it possible to easily break it down after each session. But do the pins ever come loose and fall out?
The power, and more specific, the powerspike - is awesome, for a fixed and very optimized 2 line foil kite, indeed.
But having said that - we just HATED those back in the days, except for "perfect" conditions - which never happened
I find, that on land, the "margin" is so much bigger, as these foils are out in way less powered condtions (meaning much smaller sizes relative to the wind of the day).
And they can fly forward somewhat, to ease off, if on the edge to getting overpowered
On the water, you need a lot more power, and your "window" between being underpowered and overpowered is extremely small
Also, the wind is typically much more gusty, when "a lot of wind", right ?
Just my thoughts and experience...