Neat concept. It’d be interesting to do a spin on it that expands it to a 12”/13” footprint, allowing it to have a full keyboard, making it thinner (since components can be spread out), and making it more practical for tasks like writing. Think something like the defunct 12” MacBook, but with a minimal UI reminiscent of an 80s Mac on a grayscale display.
There are e-ink tablets that can have a keyboard attached to them that kinda approximate that, but I’ve always found the KB-tablet-stand form factor clunky at best, and they tend to run some Android derivative which is going to feel slow compared to “bare metal” software running on an SBC.