I have been meaning to post a pic of this routing for a while.

We are big fans of Paul Thumbie mounts for bar-end shifters, but when you try to mount those alongside either bar-top brake levers or a handlebar bag bracket, it can get pretty crowded.

For the Bensonmobiles, (LHTs) I routed the cables throught the Arkel bracket to keep the lines free of kinks and corners.