Everywhere is HD universe, Ride!!!! Who cares what you ride or what they ride?
JUST RIDE!!! If the HD riders have a problem with your Yammy, do you really want to be around them?
If you're looking for a resto/purist group I'm thinkin' there's not many real-time riding groups out there, at least not on a local level.
As as been said already, RIDE to the local bike cruise or hot rod show, there will be somebody to talk bikes with and ya might find some other riders.
BTW, you not wanting to ride with HDs shows the same prejudice as HD riders wanting nothing to do with you and your Yammy. Purists are pussybitches, I don't care what brand you prefer!!!