>>1059599>Jtek do a bar end shifter, I'm not sure whether it would be mountable on a downtube boss though so you'll have to research that yourself (unless a bar end shifter would work for you instead). It's not cheap though.I did some more looking around last night and a company called Microshift from Taiwan makes a bar end shifter for Nexus hubs that can be mounted on the frame as well.
