This is the sort of thing I'd want to modify the keyboard firmware for. QMK has explicit support for this kind of thing, for example: https://docs.qmk.fm/#/feat

This is the sort of thing I'd want to modify the keyboard firmware for. QMK has explicit support for this kind of thing, for example: https://docs.qmk.fm/#/feature_advanced_keycodes?id=mod-tap https://docs.qmk.fm/#/feature_advanced_keycodes?id=mod-tap