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It sounds like any momentary switch can be repurposed. Finding one that isn't too colossal, mounts nicely, etc, is problem one (the one you picture is quite deep, has big lugs for solder, etc. check the mechanical drawing).
The bigger issue is that it sounds like climbing shifters have to be plugged into DI2 shifter units, as satellites? You can't just have them on their own? I am not sure on this, DI2 is a complete mystery at times, and what you can/cannot do seems wildly variable. But you might not be able to have just satellites.
infovore
Brommers
I am dreaming about TRP Hylex with custom momentary buttons on the levers rather than the usual climber buttons "integration".
Anybody on here care to give me a bit of advice on what to get hold of and read up on to make this work? I have a very capable friend I share a workshop with but I want to understand what I need before asking him to help.
I'd like a 1x drivetrain with an 11sp di2 mech shifting up using a button on the right lever and down using a button on the left lever. Is this daft?
Maybe this