F20 class is the only solution. And just make sure the N20 qualifies in similar fashion to what they did with the Taipan 4.9 (F16) and end the drama...
Reviving the F20 discussion from 2001, etc. makes a lot of sense. It seems the main resistance then was centered around the perameters of the N20 that were outside the box.
As suggested then (by Wouter, et al) just grandfatehr the N20 and go from there.
Problem solved and you may pick up a few "lesser boats" to trounce as well.
Jack Woehrle Hobie Wave #100, Tiger Shark III HCA-NA 5022-1 USSailing 654799E Alachua FL/Put-In-Bay