You got me on the edge of my seat now, you can do it, you can do it, you can do it!!!! That's my cheer leader impersonation.
If that is a taper fit on the stator (most likely is) make sure the taper surfaces on both pieces is clean with no burrs. That can affect the fit and make it wobble ever so slightly and continue to shear the keys. I had a dirt bike that would throw the flywheel about every 1 1/2 races until my buddy fixed it for me. Maybe wipe it with some emery paper ever so lightly them clean it up before installing.