That is exactly my plan. I have a small PWM controller off ebay that i use to slow it down, i just need to tweak the flipper plate and angle of the base to get it reliably flipping. Too steep of an angle and projectiles will not flip, too shallow and correct direction ones will fall and flip. One of those things that need fiddling with to get right.
The motors i have are off ebay, inline 12v 7 rpm i think. Not super powerful, but it takes a lot to stall the plate. If needed, i can upgrade the motor easily enough.