in a word yes. David Lugg's fully foiling I 14 had plug in foils. Simply put two 1/4 inch rods into the foiling foil and two corresponding female 1/4 sockets. If the fit is tight enough you shouldn't lose the foiling foil. When one isnt using the foiling foil just put a piece of tape over the holes.

I guess locking grub screws could be used on this princple if one wants surity the foiling foils arent going to drop off in surf.