I've created a new Chord Map, inspired by Cool Hand, which I call GeekMap. Details are at my GitHub repository
I use my Twiddler primarily with Termux, sometimes using Bash and Vim but usually through Emacs with OrgMode to do everything on the road that I do at my workstation in my office.
GeekHand is designed to let me type anything I can type on a standard ASCII PC Keyboard with numeric pad.
I'm a touch typist with a QUERTY keyboard, including special characters and function keys and needed the same from my Twiddler.
I love it that the printing on my Twiddler keys wore away so quickly!