I want a Keychron-quality mechanical switch that triggers HomeKit actions.

Something along these lines with a little configuring perhaps?

Something along these lines with a little configuring perhaps? 

https://drop.com/search/macropad/drops

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Most of them don’t, that’s a bit more rare. Glorious has one: https://www.gloriousgaming.com/products/gmmk-numpad-keyboard but if you can go wired, Keychron has one actually

Most of them don’t, that’s a bit more rare. Glorious has one: https://www.gloriousgaming.com/products/gmmk-numpad-keyboard but if you can go wired, Keychron has one actually https://www.keychron.com/products/keychron-q0-plus-qmk-custom-number-pad