Hack idea: a keyboard that records this data (speed of typing? force of key presses, maybe approximated by keyboard vibrations?) paired with an app that tweaks

Hack idea: a keyboard that records this data (speed of typing? force of key presses, maybe approximated by keyboard vibrations?) paired with an app that tweaks font settings accordingly. Definitely way more effort than it's worth, but it might be a cool dumb thing to build.