on my new 750k5 I drilled through the clubmans and snaked each wire through.  It looks stock but was a pain in the ass to do. About 2 hours total. Normally what I have done is file out a channel and loomed the wiring out of the bars.  but since this bike was so clean looking, I decided to give it a shot.  If you have the patience, i recommend.  I can post pictures if you'll want.