Hi all! If you happen to be following along at home, Jason wrote in to the support desk and while we were able to point him towards our collection of community-made custom widget libraries here, it doesn't look like there are any libraries there that were made specifically for the Kendo UI elements. If you're feeling ambitious however, you could try creating your own custom library consisting of widgets similar to the Kendo UI and then loading that into Axure RP. Some additional information about creating custom widget libraries can be found here:
I hope this is helpful!