I was chatting to a couple of Rohloff owners though not Brompton ones.
The Birdy guy felt he needed a lower gear whilst the other bike, a self design incorporated a 2 speed in the bottom bracket(schlumph drive) to get round the gearing problem, something more noticeable up north.
The Alfine hub will have that issue too, though obviously should be fine for rides to the station.
Strangely, my mega painful hip at the moment feels near fully recovered. Whilst following near every bit of health science going, I suspect the sore point of issue was spinning in low gears.