Many regions now also have SM2 to deal with exactly what you're talking about. It's quite popular in the N.E. The solution is already there.

I actually agree with Dan. Don't change IT rules to accommodate the car. Change the car to be legal with the class YOU CHOOSE to race with. When it becomes time that the car you're running isn't where you'd like to be at, sell it and buy something else. Yes, maybe hard to do emotionally and potentially financially. I just went through that recently after selling my ITB car and bought a guess what... LOL