People have done it with clubmans with the wires inside, notched the housing and run the wire outside, used electrics from other bikes and used aftermarket units. Do search and find all the ways it was done. I have done it on the inside and used aftermarket units, choose what ever works for you. Check for clearance between the master cylinder and your switches. I like having my levers adjustable to suit me. Don't like them pinned to the bar.
Braided brake lines = GOOD!
Steve