I've seen that... seems like a huge overkill solution and way too freakin expensive. You'd have to cut the old lever off, or remove the primary anyway... If I had stripped splines in the arm, I'd put another OEM on and use a .02 cent washer.. I've done the washer thing on 3 seperate bikes when the lever started to loosen up. Never had to touch em again.
The thing is, without the washer, the head is galling steel against aluminum when you tighten it up. Which causes the bolt to be "tight", but not as tight as it should be. You get sufficient pinch when using a washer at far less torque.