The only tubeless setup on the back tire I have seen is here.
Our tires are too big for the common tubeless kits. For some $$$ you could try and find custom rims without spokes somewhere that would be a direct replacement.
Did you unplug the high beam wire? So that if you clicked your switch to high beam your headlight would turn off?
I had to put in a additional switch to turn off just the headlight.