This is the holy grail of foils. Ozone did a para glider proto like this using a micro filament to shape the leading edge. Maybe Flysurfer are trying something similar.
I'm the one Who is using Ozone as I posted here ön KF & Foilzone.
I've been thinking about this for 2 years how to get the weight down,
because I found the recent inflatables and even Foil types were heavy for light winds.
The handling difference, upwind and steering speed will be of the new 19m Single surface
and a S3-21 the same as between a Formula 1 Race Car and a Truck,
without moving moving 11 lbs of air mass at the end of the lines
The brake through idea came from another user on KF to just to convert a PG
I'm glad I trigerred and challenged some developments by posting out of the box ideas
and Flysurfer is followinging it Up