[Eeems]

I would expect that a reMarkable does actually fit the billing for you here. You have root access[0], and there is a mainline kernel build available[1]. There are several terminal emulators available as well[2][3]. If you don't like the built in reader, there are alternatives as well[4].

0. https://remarkablewiki.com/tech/ssh 1. https://toltec-dev.org/stable/#section-kernel 2. https://github.com/timower/rM2-stuff/tree/master/apps/yaft 3. https://github.com/dixonary/fingerterm-reMarkable 4. https://toltec-dev.org/stable/#section-readers