you don't owe me anything
The banjo is literally just that - a banjo bolt with a built in switch, exactly like the one on the rear caliper. You should be able to pick one up at any dealership. You can either put it in the caliper or the hand control (I think the threads might be the same but don't quote me on that). I put mine in the front caliper but you obviously have the wires attached. I stopped worrying about the looks of my bike a long time ago so I just ran the cables inside some shrink wrap and cabled tied it to the brake line. Doesn't look as clean as some would like but not too bad either