I ran mine in the end of the bar, then drilled a hole at the mid way point of the bars and fished the wires out there. don't see a way you can use anything that would install in the end of the bars after you install the aftermarket heaters.
Thanks to the Interstate Highway System, it is now possible to travel from coast to coast without seeing anything.
-- Charles Kuralt
I never plan a ride, just the destination and that's always subject to change.