The shifting is still okay. In this thread I found some examples: http://www.bikeforums.net/classic-vintage/676778-bar-end-shifter-cable-routing.html
That was my go-to thread too for bar end cable routing. Curiously I have found time and again that shifter cables aren't long enough for my (1980's Gazelle) CX frame? Do you use tandem cables?
I used the inner cables that came along with the Microshift shifters. One of them was just long enough.
@Smolders started
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The shifting is still okay.
In this thread I found some examples: http://www.bikeforums.net/classic-vintage/676778-bar-end-shifter-cable-routing.html