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very geeky, show us your workings
Can't take much credit, mostly off-the-shelf.
Keybow Mini + Pi Zero WH + some code tweaking and chopped up a stick on garmin phone mount from AliX.https://shop.pimoroni.com/products/keybow-mini-3-key-macro-pad-kit?variant=27890390696019
For short hard efforts, I toggle between ERG and Resistance (on TR), where ERG is for the rest period and Resistance for the hard part and is pre-set - no gear changes needed.
It helps that I've got toggle and resistance up/down keys out front.