It's a shame that attempts to build open hardware and firmware for Topre/Niz-style capacitative rubber domes haven't gone anywhere over the years. Unless I'm out of the loop, people are still stuck yanking PCBs and controllers out of their Realforces and HHKBs to use domes in custom builds.
One could use those silicon popper OCD toys as a keyboard construction method. Still might need some sort of compliant spring mechanism with hysteresis.