One of my touring bikes has a Rohloff hub. And the Rohloff shifter is a twist grip shifter. I tried lots of different places for the shifter and finally settled on the right side bar end, bought the Hubbub adapter that allows me to put the Rohloff shifter on one of the bar ends.
No, I do not call this a bar end shifter, but ... in a way it is a bar end shifter. And no, never hit it with my knee either.
