Andre, I read your post, and I agree ... but I don't know what to do with it.
That's why I separated a discussion, which will remain theoretical until you have time to do something about it, to another thread. For now you should assume that a quality bike that fits you at most pressure points was competently specified and outfitted.
There are two things you have to do before you start messing with handlebars and handlebar grips, and neither of them are suited to fine-tuning on a time-limited tour in your circumstances. You have to decide what sort of posture you want on the bike, that is the angle of your back. You have to decide the height of the saddle. Both can be set near right, and probably were or you'd be in pain now. You can fine-tune them at home, then decide on a handlebar and grips. There's plenty of experienced advice here but while you're on tour is not the right time to apply it.
And with all the above set up optimally (which I have not done yet) I'm still not sure if it just takes more time to get to love the Rohloff grip shifter or that the Shimano is just that much better.
You still haven't understood the magnitude or the timeframe of Herr Rohloff's achievement, but the shifter is a good example of Rohloff Reality. The Shimano shifter, new out of the box, feels smooth and user-friendly and probably is the best shifter in the world, if you permit the qualification "new out of the box". It's designed to survive maybe 50,000km/30,000m; many are in service well beyond that MTBF. The Rohloff shifter is a precision equipment with much closer tolerances. You need to run it in, and then it will last you 250,000m or so, just the qualification "or so" being longer than the entire expected service life of the Shimano component. Nobody knows how long the service life of a Rohloff is: it is an ever-moving target. But it takes five or seven or ten thousand kilometres for the Rohloff to be run in, depending on who you ask. I despaired of the bloody Rohloff shifter ever being as smooth and pleasing as the Shimano controls on my other HGB bikes, but it does happen. Eventually you might even be able to shift the Rohloff with two fingers as you wish to do; I now use only a thumb and a forefinger or sometimes merely a little forward or backward pressure on the flat of the original triangular shifter, and have since about 10,000km/6,000m. You can see what I mean about different magnitudes and timeframes requiring a different attitude and approach.
You're packing the experience of a year into a week, Flocsy. You're doing well. Ask Matt how long it took him to plan his first tour. I spent two or three years wondering if I really wanted a Rohloff when I was already well down another path of automatic bicycle gearboxes. Everybody who sounds more certain than you feel has been where you started.