The problem is that in order to run linux you'll probably want a kernel with quite a few patches and their DTS, and I haven't found anything for this yet.
Android is almost linux so with a bit of effort it's probably not unreachable, but I don't quite have the time for this yet... If someone does it then Linux with an external keyboard would probably work for me as well, there was someone who did it with the remarkable (it's already linux but they ran standard X11 on it), but the refresh rate was a bit too sluggish, something like the daylight computer would probably do nicely!
[1] https://news.ycombinator.com/item?id=40459958