Really I think just banning the FGX from any F1 races would be the way to go. It may be cheap to buy, but how many modification parts do you need for it to be fast and reliable?
It just goes against the whole idea of F1 being a cheap, simple and great looking form of racing. And because the FGX was allowed at some clubs, you now need a 190mm kit to make your F104 competitive.
Do we really need another touring car class?????
Just my 2c
Mike