The tablet also works fine without using the cloud service, it has a built-in webserver to upload documents to it that you can just access via WiFi or USB-LAN.
Really this device is a hacker's dream in terms of openness. The only last thing I'd wish for was open sourcing the main software application running on it.
In other words, what good is a custom reimplementation of it if you can't make it point at them without dns hacking?
Do you think one could hack it into a "screen" by streaming a black-and-white image data from a computer to it?
So the connected computer would do all the heavy lifting related to rendering, compress the result to something that is really easy to decompress, send it over, and tablet would just decompress a bitmap and blit it to the screen?
Given the low refresh rate of the panel, something like that should work just fine. Pretty sure I saw a YouTube video by someone who hacked it together using periodic screenshots.
If the underlying software is open source, that would also suggest that it if there is a large enough community, it will keep working for much longer than the company supports it. And it gives hope for better software fixes. For example, the writing-lag mentioned sounds like it should be solvable with better data structures under the hood.