Huh?
Hobie events, by definition, are one design regattas.
What you don't run an open class for the hobie class boats that don't get 5 boats?
You would have more credibility with the one design argument if you acted like some of the old line yacht clubs that really believe the one design philosophy.
They throw fleets OUT ... eg gone... no start... get a different boat simply because they don't meet the turnout requirments.
What's the philosophy that guides you in allowing a hobie open class at a one design regatta?
Seems to me... You would be far better off by not allowing those guys to race at all and then have them switch to one of the hobie class's that does have a one design turnout.
Mark