Hi Scott... as you know our indoor club nights for touring cars clash, both being on a Friday night (I race at Kettering) But i'm sure that there's a few of us (three at least) that would be interested in racing at an all weather/undercover off road facility on a weekend day... especially if it was a proper clay track!!
TBH with the current surge in the popularity of off road racing i'm sure you'd have no trouble in attracting members/racers with such a facility!
If anything, in this area we are somewhat spoilt for choice!