Greg, yes regional and national races will be going on AT THE SAME TIME. Even if it is a national class like production, there will still be regional only licensed production cars racing at the same time for regional points. Just because you have a car that is eligible to run nationals does not mean you have a national license.
Ta-da! We're half way to losing the Regional-National distinction, at least where points-keeping is concerned.

The only question becomes how do you represent the RACE finishing order for bragging rights, checkered flag, trophies, and contingencies. The SARRC/MARRS meet-up at VIR manages to keep this straight in their results - for example

And why is it OK for a Nervice to potentially create havoc for Regional drivers and not National drivers? (Sorry for the smidge of hyperbole there.) There's that assumption that one group is somehow more skilled on the whole, than the other...

The more I think about the Rational option, the more I like it!

K