Trunks must be different than stock to handle the S board vs. C-board, so yes AoA etc. can be made an option.
As an upgrade kit this makes little sense with the Flying Phantom costing the same as a new Nacra F20c. Add a $5K+ foiling package to the F20c and its $5K more than a boat designed from the ground up to foil. Pegasus didn't have the Flying Phantom option when these were built, and I suspect picked up the F20c at a bargain basement price.
it's more the other way around, the Flying Phantom is a widened F18 [full displacement boat] while the F20C was designed with the curved foils to create semi foiling sailing as standard feature, so optimized to dip back en forth in the water
