Built my first macro pad! Don't have keycaps yet but it should still work.
@graemewinter I have a working numpad!!!!! Took me a long time to
(1) flash the firmware -- I didn't know what terms to google here,
(2) give up on circuitpython since the relevant libraries appear to be broken (betting there is more I don't understand here),
(3) also give up on QMK to flash a keyboard configuration since it would not recognize my device, and finally
(4) discover KMK using circuitpython and figure out which pins were mapped where