How would it work on e-Ink Displays, can we jailbreak kindle and readers to add it like a plugin?

I come from that world myself, my first iPod Touch 4G jailbroken with Cydia at age 9 is what got me interested in how things work under the hood. So the question makes me smile. I've never tested on e-Ink. What I can tell you is that from a computer you can export the dark PDF by clicking the download icon in the toolbar, the file is a standard PDF you can send to any device. If you try it let me know how it turns out, I'm curious to see the result on a reflective display.