No direct keyboard support on the reMarkable, but you can trivially get a root shell over USB-C — while charging, unlike older USB OTG setups on phones and tablets with one micro-USB connector — so it’s totally something you can hack together.
None of the bundled software is designed for using a keyboard, of course, so it’s going to be just as DIY as the very earliest Linux handhelds. (Anyone else remember the awful HP “iPaq” PDA Linux environment? I set one up because I could, and them never see the device again because the UX and battery life were so bad.)
That actually sounds like it would be totally be ok.
If the goal is to get a distraction free writing tool all you really need is something like Vi, emacs or Wordstar/Joe in a terminal.
I never had an ipak but I did have a couple of Sharp Zaurus PDAs running Linux back in the day.
Just for kicks. I never did much with them.
I’m less bothered about surfing the web on something like this.
When writing I find it easier to type and edit what I’ve put down.
Not sure if Remarkable has an optional keyboard or not but I think using a pen requires more thought overhead for me, if that makes any sense.