I believe that someone suggested on the Endurance website that the DD series and the KTM series could perhaps be run alongside the KRC. It's been done before, and it's no secret that the KRC series is struggling due to thin grids.
I think that the KRC are looking into that option anyway, with the idea of maybe reducing the length of the endurance races so that they are more affordable to teams. If you had a couple or 3 other race series' helping to take some of the financial pressure off, then it could only be a plus and might be what each championship is after.
You could have a 2 day meet, with practice and qualifying on the Saturday,with a 3-4 hour endurance meeting in the morning, followed by the sprint races in the afternoon. Or you could do it the other way round and have the sprints in the morning. Or indeed you could have the sprints either side. In fact the only option I can't see working, would be having the sprints run at the same time as the endurance........although I'd be game!
You'd then seperate the DD, KTM and whoever else from the mainstream clubs like NE, and they'd gain their own clear identity as a matter of course.
I promised myself I wouldn't get involved in these debates, but I can't help tinkering.