I looked at the groupo idea just for fun when I stocked up on parts recently. I used white Uno crank Rohloff, White hubs and BB. Brakes were paul and whatever levers were reasonably available. I wish White or Paul made say Road levers. Takes you to a few US manufacturers. Better still would be Phil hubs, Uno cranks, and Paul brakes (and all their other stuff). But as far as I can tell the Phil/Rohloff collaboration was a one-off for a show. I forget who made the post, but it was a big name straight one.
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You can make a Rohloff Groupo but it has all the appeal of German style, French engineering, and Italian efficiency, or however that goes.
I also had an LX based deal, that was all PAUl: brakes; post (don't really think set-back posts belong on touring bikes, but it is a nice post). At the time Paul didn't make a rear hub, so I did White as I got a good deal with the above deal on the other bike, but I wish I had done Phil. But paul might make a rear hub. Then you do all the little pieces: moon units, cable hanger, GO Pro mount or flashlight mounts.
I also had an idea for using their brakes, but it was pretty weird, something like the bar end ones; top thumbies since bar end is out; those hood only blobs for people that don't use road levers to rest on (not Paul); and Either a 2 finger brake on the top or the Cross brake, I forget what I thought would work. Unconventional but not counter-functional. The piece de resistance would be if you could score Paul Deraileurs, but even if you did and they make a rear hub, they wouldn't match up. But that would be a full groupo, except for the front crank.