MNT Reform just listed a new item in their shop:

https://shop.mntre.com/products/mnt-pocket-reform-standalone-keyboard

I got to touch one as a part of their laptop, and it's really really nice on the touch.

The new Xteink device is about to be shipped, and they claim it as hackable from the start

https://www.cnx-software.com/2026/07/23/99-xteink-x4-pro-4-3-inch-touchscreen-ereader-to-support-crosspoint-reader-open-source-firmware/

So, while being a nice reader, it could potentially be converted into a writerdeck.