Probably a bit far to send them but I'm also fitting some 12 bars with Rivco Risers at this very time and a company in NZ is rebuilding my cables to suit. http://www.melbarcables.co.nz/. Friendly people getting them 200mm longer. They needed the original cables as there are some specific parts that would be expensive to make. Wiring I just ordered parts from http://www.cycleterminal.com, again friendly and fast service. Not sure if I'll actually need to lengthen the wires but planning ahead. Doing the brake cables next week.
I have factory heated hand-grips on mine and wanted the factory end weights too so drew up and had made inserts for my bars to allow them to be reused was a hassle but will be worth it as I'm 6'4" tall and the old bars while comfortable were just a little low.
Its slowly going back together.