Adding external button to Kitronik ZIP Halo HD for micro:bit?

I have a very cool looking vintage “stop” button that I want to use to snooze an alarm clock. It looks like the Halo HD is perfect for the alarm - is it possible to solder on an additional external button to the Halo HD? (I’ve soldered before - really just checking that pins are accessible and that there are some available to be addressed to an external button?)

Pin 1 and Pin 2 are wired to breakouts / solder pads for wires or headers.

Amazing - thank you @alphanumeric (sorry - not sure how I didn’t see that.)

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It’s easy to miss stuff like that, been there done that. ;)