At long last, I did get back to the fellow with the Kawasaki. Cut the cuts on a proper key blank, KW15P. Worked nice and slick. Beats trying to modify a different blank.
Second lost MC keys today, a Yamaha. Been playing phone tag with the guy. Well, of course the blank I need is 100 miles from here, and they have a $25 min order, and so on. But, a KA15 was modified to fit, and we're good.
That Kawasaki sure was a confidence damager.
Thanks to all who helped.