To clarify what Derek is asking is for a SUPERBIKE to "race up" in a SUPERSPORT class.. Example is Ninja 400 Superbike mod up to D superstock/supersport...OR R6 superbike up to B supersport/superstock. Current rules in layman terms is once its a superbike its always a superbike in any class due to the modifications.
Not just "riding up" .

I'm just posting to clarify not to encourage either side of the conversation.
Danny