I'm still on the search for A5-sized E-ink screen, with HDMI or USB-C input (diagonoal: 25 cm / 10 inches diagonally).

I'm wanting to build a solar-powered e-ink laptop - so you can write / code in the sun. Mint Debian under the hood.

Open to ideas - trying to keep everything open-source architecture.

E-Ink's own site doesn't list any display modules that is larger than 13 inches that also has touch ( https://www.eink.com/product/epaper?search[]=16 ) so it's unlikely there is such a thing. Neither of the e-ink monitor makers, Dasung and Onyx Boox, list touch capability on their 25.3 inch monitors either.

It won't be cheap for sure. If you just want 1 for personal project, better to buy of the shell eink monitor(i remember dasung has one) and gut it.

Sony DPT-RP1? Some are jailbreak-able.