From what I've found, its almost easier to find a frame with a title on ebay. It's how I got my XR plated.
What route are you doing for lights on the KX? I've been looking at options for lighting on the YZ, but the best one (finding used pre e-start WR stator\flywheel) is a crapshoot on ebay. That or a 35W Electrosport stator which I don't trust too much.
I've considered re-winding mine, but there is very little info online about taking an MX stator & adding a lighting coil to it.