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sbbohr-
Are indexed 3 speed shifters made for front derailleurs not an option?
e.g. the Shimano Acera left shifter: https://bike.shimano.com/en-EU/product/component/acera-m3000/SL-M3100-L.html
neu
Yeah, the Bikegang kit basically
https://www.bikegang.co.uk/bikeganghut/Brompton-2-to-3-Speed-Sprocket-Cog-Thumb-Shifter-Kit-MiniMODs-x-Sturmey-Archer-p115439619