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I mentioned the problems with nibble ordering for framebuffer output. I played a bit and what I've found is that a combination of Xvfb and x11vnc (both built with the buildroot environment) plus kindlevncviewer does a resonably good job. It's a bit awkward to use three programs in the place of one X server, but x11vnc does a good job recognizing changed parts of the screen and kindlevncviewer knows about eink updates. Together, they provide a nice bundle. Memory footprint is about ~20MByte RSS.
I did not explore this further, but x11vnc has options to start an Xvfb server automatically upon vnc client connection.
I was still using this with SSH-forwarded X11 applications (and even a window manager) from the USB host machine. It would be interesting to see if the K3 could be switched over to a Debian-ARM-based userland, running Xvnc (I think Debian has this, would probably work better than Xvfb+x11vnc) plus kindlevncviewer for the graphical UI.
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