Originally Posted by
PedalingWalrus
... The only thing that slightly worries me is the ergonomics of the twist shifting. On one bike the dial is quite robust and stiff and almost makes me feel like I'm going to get a carpal tunnel if I used it for more than 2 consecutive weeks (the longest trip I did with a Pinion)
Sounds like your concern is wrist issues, not lack of grip.
I have the second version of the Rohloff twist grip shifter, that version did not last long and it provides rather poor grip. And, that version is soft rubber that easily abrades.
I made an improvement to the ability to grip mine. Shoe Goo is commonly found in stores, it is a viscous liquid that comes in a tube, you can build up rubber shoe soles that have worn down. Comes in clear (common) and black (less common).
I added three bumps to my Rohloff shifter with black Shoe Goo, I think I used two layers, possibly three. I get a much better grip now.
First two photos are five years old. Last photo a year and a half.
The three beads are in the 12, 4 and 8 o'clock positions in photo below.
I use the Hubbub adapter to put my shifter on the right side end of the drop bar.
Not sure if this would help you or not, but it certainly helped me. But that second version of their twist grip was rapidly replaced with a third version because this version was so poor to get a grip, plus it abraded quickly.