A quick place to start might be the Sound called
Test Keyboard Events (MIDI, MPE, Kyma Control, Pen eraser)
in "Kyma Sound Library/Check Inputs, Outputs & External Controllers.kym".
I always use this Sound during sound checks to make sure any keyboard-like devices are connected and communicating properly. It won't show you polyphony, but it would give the ranges of values for testing the hardware controller's ranges.
BTW I think I am the first Kyma + Striso user and so far it seems to work well in MPE mode natively!
Eager to see/hear a video!