I haven't tried these particular Humpert bars, but I have different Humpert bars, the Tour in stainless steel, and can say they're well made, quality bars. The particular ones I have offer just a slight angle to the ends, but the grips are long enough to fit Rohloff rotary shifter and a separate brake as long as you buy the 4-finger grip version. Many of the topclass German bikes with Rohloff boxes come with Humpert bars, including optionally the cheaper version of these multifunction bars, so the likelihood is that Humpert bars are Rohloff-capable and/or that the designer has considered the peculiarities of fitting a Rohloff rotary control. Utopia, whom I know (I have one of their bikes), sells the vast majority of their bikes with Rohloff boxes, and they offer the Humpert Hornbar as an option. Interestingly there's a note that the narrower, 52mm version won't go on electric versions of their bikes, presumably because there's not enough space for the controls, but that the 60mm is fine.
I have a Humpert X-Act Swell adjustable stem on my favourite bike (or had until I fitted the n'lock, described elsewhere), and Julian is right, Humpert builds their gear so you can expect to leave it to your grandchildren. The Humpert X-Act headset A118AC on my bike is a Cane Creek-built copy of their famous S6, built to last forever. Never seen anything flimsy from Humpert.