The big issue is that the KTM runs the lighting on AC, and the bike is equipped with only a little AC regulator for that. The easy way out that costs $$ is just setting the whole bike up for DC power. If you want to spend money, Baja Designs' wire harness add-ons for the dual sport kit and the DC rectifier/regulator will do it. You need the HD R/R.
I'm not sure how I'm going to do it yet. I might just make my own harness. I'm likely going to rewind my stator to get around 200 watts, so it'll be similar to the BD one you have.
We probably ought to talk on the phone on some of this, since I'll grow a beard trying to type it all.