OK, going against the current .. Internal oil bath geared Rohloff Hub, you can cope with the Grip shifter a number of ways ,
My example for this discussion, putting 2 stems on the same threadless steerer tubes lets you mount your handlebar bag mount on a lower one,
and by buying a plain type 1" (25.4 or 26.0 mm depending on the stem you buy)aluminum seat post and cutting off the top portion,
You can solidly mount the grip shifter on the 7/8" 22.2mm upper portion of that seat post.

16t Hub cog and a 38t or 39t chainring is a good touring range ..

retrofit kit has a torque transfer arm that attaches to the left chainstay , External shift box is quite Durable , and uses covered cable housing the entire length ..

default gear shifter is an 8mm wrench on the External gear shift mech with the 2 cable box off, in the yunlikely event one of the 2 cables fail.

Internal shift involves a 3rd cable to rotate the gear sequencer, that cable would be the weak link.