FWIW, the 3 ratios in the middle are the AW3's .75 and 1.33
on the SRF5W, 1st is a .63.top is 1.6 (SRF5 also .67, change_ .79, 1, 1.27, 1.5

Im using a BSR / AW3 and a Schlumpf Mountain drive crankset, made in Switzerland.
there is a Brompton plug and play version of those
[CM Wasson, Brompton dealer, stocks them in Cal]

hubs 3 gears get used all over again, in low range on the crankset planetary,
for a linear six ratios, rather than the 2 cog half step 13/15 with the BWR hub.

im running a 54/15, range is about 80 to 18 GI..

when Brompton went to Sachs, since bought by SRAM,
for their 3 by 2 hub,source, [Mk 3 bikes]
the IGH ratios were unchanged ,sightly wider, .73 , 1.36 (9by3 dual drive, too)
but not as wide as the BWR, _ .64, 1.57
that they got, custom made for them at the new owners of Sturmey brand.

More recently I got a Bike Friday with a Rohloff hub,
16t cog 53t chainring 406 wheel, nearly equal steps..
low similar, 12th is like the high on the BSR/MD Brommy

just not the fold down possibility, into 4 cubic feet