The brake bias is not a trouble with a 3 chanel radio with a mixing function.
But if you brake with the motor on the spur gear, you brake front and rear at same time and at the same intensity, so if you go brake the front with mechanical with this, not sure about the result

But i like the idea of the front Neu motor cover, this will psh back the motor, so with a dremel work, maybe the front cover will clear the rear caliper and disk
But the motor bolts should be longer, and longer = weaker