I've got a rather specialized version of that at https://github.com/hillwithsmallfields/JCGS-emacs/blob/master/special-setups/tasks/org-agenda-kiosk.el

It's aimed at navigating a collection of org-mode files via the numeric keypad only, and I wrote it to go with some custom hardware I made (a screen and keypadded embedded in a corkboard, so I can keep all my "things to do" lists together, whether on paper or on the computer), hence it having mappings for a keypad rotated 90degrees!

__John