I recently discovered Tinker WriterDeck OS (https://tinker.sh/), which I’d been meaning to try, but this sounds like an even easier solution for repurposing old laptops and writing without distraction.

I'm working towards something similar with an Emacs configuration. That way, it's a workflow I could use on a daily driver as well.

I was initially skeptical of the learning curve, but the power of Emacs is well worth it.

Nice! I have been toying with KolibriOS and MenuetOS for my anti-social platform. You can network on both, and sometimes requires a direct hardwired Ethernet cable. Originally I was interested in them given they are written in assembly using FASM. I was a 1977 CBM (Commodore PET 2001), so I am more of a lime-green on black screen vs. the DOS grey/blue. Cool!

Also, this:

http://mynor.org/my4th_forthdeck.htm

And for retro users,

there's a TRS-100 which can run a moddem ROM and Forth.

https://www.strangegizmo.com/products/mforth/

It it has an editor you could reuse that as a much smarter version of AlphaSmart.

WordPerfect 6.0a for DOS and MS-DOS 6.22 is what we used back in the day™.