The Corne keyboard is a split ergonomic mechanical keyboard.
There's an interactive configurator on QMK that will help you figure out where the keys might go.
Similar to the Corne, the Hexidox is an even smaller keyboard that discourages movement outside of the pinkies. That keyboard also has an interactive configurator to get a feel for how the layout might sit.
QMK can be configured with Stenography if you want to boost your typing performance. feature