Thanks to Marek's suggestion, I have successfully built and tested "Franken-Foil".
Sailed it in 8-10kts, wavy, 8.0 Ezzy Cross. Much better lift, slower speed but pretty good (16kts on apple watch). It felt almost no different although the lift is slightly further back.
I'm running 900 up front with a 800 in the back.
Local machine shop cnc'd the fuse for me and I chopped the back part of the 800 wing to maintain a gap to the foil mast.
I have to tune my mast rake a bit more forward. I was at -1.5 degrees and now with a shim I'm at -3.5 degrees which is too much.
Lots of fun experimenting - thanks Marek!

