Yes, but 120mm wide?
Aren't most of the SA 3 speeds 120mm?
Pretty sure the ones they use on Bromptons are spaced down to 110mm (although I may be incorrect).
Sturmey Archer 3-speeds are available in various sub-120mm OLN dimensions which can easily be shimmed out to 120mm precisely, or you can just stick a 116-119mm one in a 120mm frame and tighten up the nuts.
@AlfredIV started
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Yes, but 120mm wide?