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finger_jockey
Ben Cooper of Kinetics did something similar to enable the back-pedal gear change and braking on a Duomatic hub (SA redux version, I think):
https://www.kinetics-online.co.uk/folding-bikes/brompton/cableless-brompton/
It looks like a modified 3rd party tensioner for the Brompton (he says "The tensioner is reinforced, and it moves up to hit a stop when back-pedalling"), but I cannot work out what the white rod is for on top of the right-hand chain stay.