One of the links in this article leads down a heck of a rabbit hole for those of you who love ultra-tiny keyboards: Plover, the open-source stenography engine, which uses what is essentially a 15% chording keyboard and a very dense shortcut expansion dictionary to let you type at ~200-300 wpm vs. the 40-120 wpm of QWERTY.

https://www.openstenoproject.org/plover/

Yes, there are people who use it for programming, too.

Not my thing at all, but maybe it's yours.