In France we had the "Coupe Ducati".
Everybody rode the same bike (was the 620 Sport), and minimal modifications allowed.
Maybe the futur of the DD series could be 2 standings (583 and 620) because I don't think there may be enough riders to run 3 classes (with the BB). In this case, people would just have to sell their BB on ebay and to play with their 583
Anyway, THE DD SERIES ARE GREAT. They're powered by passion, for people powered by passion.
It may change or not for next year, I will be in.