User blog comment:MOTZI/Think About It - Hybrids/@comment-4846081-20140331000351/@comment-8506165-20140331081202

...except hybrid Kennen would be atrocious, and would neither duel as well as AD Kennen nor teamfight as well as AP Kennen.

...I guess Zhonya's as a defensive item on AD Kennen would be the closest you'd get to that? Still hardly hybrid, but you'd have the R-Zhonya's combo and then still be AD Kennen... but of course, Stasis-ing in the middle of a stunned enemy team doesn't really synergise with being an AD carry.