The achilles heel of your proposal is that very few US Sailors will schedule and pay for two NA's in their season. There is a small group ... perhaps 15 to 20 teams that will play this much and this core of very active sailors is the core turnout for a USSA championship.
In 2012, When you add in the BYOB factor (charter your own boat) PlUS geography (how close are the events to your home).... plus similar class NAs (F18 = F16 = N17.... or (Hobie 16's Hobie 20s or a single handed Hobie boat to draw a few teams to their event....) the number of sailors willing to compete at their second event, a Stand alone USSA championships is below ten teams. The event can't be credible or financially viable with this small core of sailors.
IMO, the only solution is to partner with a class OD championship and rotate the classes and displines..
The multihull community can NOT screw over host Yacht Clubs who commit to a long regatta and have a terrible turnout of sailors....
