For folks who are interested in the UX design of chorded layouts, Artsey and Ardux (https://ardux.io) might be of interest. Artsey is a specific 2x4 one-handed chorded layout (of which Ardux is now a more robust implementation, with optional variations for slightly larger numbers of keys) that borrows a lot from colemak. I'm a big fan.
I particularly appreciate the simplicity of a 2x4 layout — OP's device rocks, but I worry about the ergonomics of thumb movement.
I particularly appreciate the simplicity of a 2x4 layout — OP's device rocks, but I worry about the ergonomics of thumb movement.