My Brompton got a new crankest, the 2nd gear is planetary, so chain never leaves the chain-ring,
But when low gear in the 3 speed is a bit too tall, I do a double shift,
engage reduction gear [heel button on crank center]
and flipping 3 speed trigger HB lever, into high ratio, is the next lower gear..

2 planetary gears .. chain stays put.

for My Rohloff Bike I bought a Surly Stainless steel ring, a 110 38t ..an excellent product.
16t on hub , 26" wheel ... both bikes have the same low ratio, now. ~ 17" ish