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@sbbohr
g'evening.
Firstly, Sachs / Sram hubs have no spares available so owning one is a ticking time bomb!
Secondly, to get the "correct" ratios the hub uses a 13/15t set up, 1/8th pitch.
The tooth profile is also a bit odd, there are not dropout profiles like most sprockets have instead one tooth is much smaller in height etc.
Its a bit of a minefield, I used to care about finding some, I could easily have a few million made via SJS but most of the hubs have shit themselves by now and it just makes more sense to go with a BWR even though the initial cost is somewhat
The Brompton DR system is not super precise, so you can often get things to work, but it is also easy to fit stuff that just wont work however hard you try ...
Yes, just fitting a single sprocket would be a cheap option