Millmax Pins: https://www.digikey.com/en/products/detail/mill-max-manufacturing-corp/3320-0-00-15-00-00-03-0/4147392
Millmax Headers (tall): https://aliexpress.com/item/32719808627.html
nice!nano: https://nicekeyboards.com/nice-nano/
zmk firmware: https://zmk.dev/