Will the HT hulls be able to take the loads from a jib bridle gracefully?
The new F18 Bimare hulls are 12kg - (each) heavier than the new HT hulls, so you've got a lot of room to add reinforcement for jib bridals, etc. The beams are too narrow, so they need to be replaced.
The mast has to be replaced, sails, spin, add rigging for a jib,new beams.
Probably not worth the effort, just another random thought.