Hi Mary -
Yes on 1. The IWC has a voting seat on the US MHC, which has a voting seat on the IMC. You're covered. BUT, I'd still like to see the IWC vote to become an Associate Member of the IMC. Friends, sailors, countrymen - lend me your name.
Second - the US F16 Class is a paid member of US SAILING. They joined to make the Blade eligible for selection as the Alter Cup boat last year. Just like the IWC, they vote on the US MHC (if they want). Same price, by the way - $100/year.