It is not hard to do, took me about 45 minutes to do.
You can argue the fact of the dry splines and say Kawasaki should pay for it.
I would say they should not charge more than 1 hour for it, I don't know what your dealer charges for labor.
I just put picts of a good spline in the Maint section of the gallery.
Chad Falstad "Hawk"
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"