The bearing won't be on the outside, the diff, diff mount, motor and motor mount all get moved as one object, like MetalMan showed.
A guy at racing has a Kyosho ST-R truggy and another with a ST-RR, both with Mikes motor mounts. Because we slowly shifted from racing e-maxx to racing truggies most of us are using dual battery setups, so they shifted the motor to the front left to make room for batteries. You might have to put a spacer under the diff and motor mount to keep the spur away from the chassis. Or make a cutout for the spur, like it has at the back. They were using the 50T steel spurs and it might not be an issue with the 46t, I'm not sure.
I'm not sure if you can flip it with all cars. For some annoying reason my TTR ST-1 has a different hole spacing on the chassis between the front mount and the back mount.
This is the ST-RR just after it was finished.

He was going to try and change that aluminum mounting plate a bit. The reason it sticks out so far at the moment is because his BEC and transponder are under there.
Hey MetalMan, I want to see a real version of that dual motor buggy