IF you go boomless the foot has to be shorter than the distance between beams or you will need to fit a track on the back portion of the sail
If the luff is longer you can just cut the hobie sail square. This works surprisingly well.
Of course try the jib. What's to be lost?!! If its bows want to stuff leave it out.
Selling the Hobie sails may buy you something you could really do with.
Factory generally knows best. See how they have made the boat better such as downhaul or whatever and pick the performance up by retro fitting.