I wanted to report on a successful (so far) experiment of shifting a Nexus-8 rear hub with a Shimano indexed bar-end shifter. The bike is my patina-ed 1971 Raleigh International, previously set up with upright bars and the standard grip shifter. I wasn't crazy about that setup, largely because the right-side grip/shifter/brake area wasn't very comfortable, and I was looking to set the bike up with drop bars. I also didn't want to use the HubBub bar-end adapter, as it would stick out pretty darn far.
I had read about using a Problem Solvers Travel Agent to ensure proper cable pull with the Nexus hub and an indexed shifter, so I thought I'd give it a try. So far, so good.
Set-up took a little trial and error but was overall pretty easy. I used a standard gear cable and rigid STI housing. Initially, I mounted the travel agent on the downtube, but it was sticking out too far, so I went for the right chain stay instead. I also initially had the device secured by just zip ties, but it wasn't staying put, so I used a hose clamp on one side. Another adjustment tip is that I had to have a shorter distance than Shimano calls for between the end of the housing and the clamp-on nut that fits in the hub itself. Also key was having a travel agent with barrel adjuster. I could play with cable tension to ensure that the gearing was adjusted correctly.
Today's test was my 7-mile round trip commute to work with lots of stopping and shifting plus a side trip to the grocery store. No gear slippage at all. Success!
I'm using SR Randonneur bars, an SR stem that has short reach but long length (the SR version of the Nitto Technomic), and Tektro aero levers.
Close up of the travel agent; I set it up as instructed on the package.