It would be expensive to design a competitive car for this never existed race class.
It would be hard to setup and hard to drive, 17.5t will feel like 600bhp touring car with no aerodynamic down-force. And, without a front-brake, a 600bhp touring car with only hand brake you can use.
And real race cars nowadays are also getting 4wd, top class in WEC (including lemans) is using 4wd hybrid cars.
*there are plenty of RWD drift cars matching your need though.