It may work, but you wont be able to use that tiny axle thats already on the motor.

First of all, I would suggest that you took a thicker axle and supported it on both sides with some bearings. Then you can just ask your sponsor to make you some adaptors that will join the two axles together!

It will still be direct drive, but the motor axle wont take any damaged from the impacts.

Secondly, I would also suggest that you mount the disc on the back. As it will take some time for the disc to reach full speed, it will be a lot more protected if mounted on the back.

Youll also be able to use the wedge while your waiting for the the disc to actually reach full speed.

Thirdly, I would suggest that instead of overvolting a single motor, you use two motors at their rated voltage.