Yeah, I might just do that. But I still need to find a replacement outdrive yoke because it is too short to use the Kyosho spur.
The easiest solution I think would be to shave all the teeth off the stock spur and use the plastic spur the way I did in the pic below. Then, use several 2-2.5mm screws and screw the stock steel spur to the Kyosho spur. This would let me use the stock bearing and stock outdrive. All I would need to do is shave the chassis a little so the gear won't rub.