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@Dammit
I reckon the Alfine stuff will be Canbus, same as the Ultegra Di2, which means that it's not as simple as it used to be- with my first generation Di2 you can, no lie, use a doorbell to change gear- it's a simple interupt style switch whereas the newer stuff needs a chip to modulate the signal in such a way that the system recognises the signal.