why not simplify it to "Run street tires of 180TW or higher in IT using existing rules and classifications"?
if it's popular, you have people to run with. what you're proposing seems like an awful lot of work, not to mention weight reductions are not always achievable. ITA cars in your system need to loose 20% of their ITCS weight if on street tires. that's 200# for every 1000# of ITCS weight. few if any cars will be able to do that. and you didn't even include ITB, a class you used ot run and know is popular in your area, and one of the more cost sensitive classes, too. What you've made is effectively equalized ITS/R with compensation for tires.
I don't get it.
Time to build a New Beetle!