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You could swap the jockey wheel cage for a longer one or use a Wolf Tooth Roadlink.
My partner's bike was, for a while, running a 42T using an older style 11s Di2 RD with a Wolf Tooth. It's not the best for off-road so I eventually bought her a clutched 11s RD instead which then didn't need the Wolf Tooth.
hippy
Shimano nerds, I need some advice. It is possible to bodge an old Di2 derailleur (the black/silver 11 s) to accept a 34t cassette? Was thinking maybe with a longer cage from some other donor derailleur, if something compatible exists?