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Matias wrote an article [1] about it and then made it into a commercial product [2], but the concept should be possible on any programmable keyboard. Perhaps it would be possible with a AutoHotkey (MS-Windows) or Karabiner (MacOS) script otherwise.
There is a large scene for more-or-less DIY "ergonomic" mechanical programmable keyboards with various different physical layouts, but common themes are 1) that they are split in a pair of two physical keyboards and 2) that they have multiple thumb-keys for modifiers / Return / Space. You could build and program just one half of such a pair. Many years ago I programmed an ErgoDox with the HalfKeyboard layout, just to try it out, and that ErgoDox I had built on a budget from mostly salvaged vintage components.
[1]: https://www.semanticscholar.org/paper/One-Handed-Touch-Typin...
That's just wrong. Ask anyone who does alpinism, snowboarding, or skiing. You'll hear at least 10+ different words for this substance.
I recently came across the Analog product from Ugmonk and I love it. It's basically just a dedicated little wood holder for you desk, and different types of cards. I use the blank lined cards.
https://ugmonk.com/collections/analog