You mentioned Rohloff. If you use a Rohloff on drop bars, there are over a dozen ways to mount the shifter if you use the stock Rohloff shifter. I tried about three different locations before I settled on using the Hubbub adapter to put the shifter on my right side bar end. But I had used bar end shifters for a couple decades before I bought the Rohloff, so it was second nature for me to reach down there to shift.
https://www.cyclingabout.com/rohloff...op-handlebars/
They show the Hubbub adapter as being wooden, that is WRONG, it is all metal. Photo of my setup below. Note that I use two V brake noodles to route my cables forward from the shifter. I do not think anyone else uses those noodles the way I do, most people have the cables sticking out the side of the shifter.
