You can use a headsail with a full length luff.
Remove the two screws that secure the feeder to the foil, hinge the feeder open and remove it from the foil, allow the halyard swivel to drop to the top of the furling drum, replace the feeder on the foil, and fix in place with the two screws. You'll probably need to apply some penetrating oil to remove the screws from the feeder. You may need to soak the hinge pins with penetrating oil, also. If you're lucky, it'll be five minutes work.