"Front tires aren't allowed to slide" . You serious? Let me ask you these:
If you're drifting and your car is about to snap back and straighten out, would you still countersteer?
If you're drifting and you are about to hit the outside wall/ go to the grass on the outside, would you still countersteer?
Furthermore, do you even know why countersteer is performed in drifting?
Countersteer is not mandatory. There are situations where no countersteer is applied, and the car would still continue drifting, and is still considered as a drift.
What is considered as "not drifting" is having at least one tire off the road.
Also, pardon me for being frank and harsh, but the "drift zone" is a complete joke. One corner? Really? Then, different drivetrains and tire compounds? Complete jokes, too. Have you even thought of the problems those regulations would make? Try running 4WD C:S cars against RWD C:H cars, for once.