Would this be possible on a jailbroken PW?

I know it is possible in KOReader, and it has been amazing for me, but I was wondering if it would be possible to have a system-wide night mode (inverted colors), so I could use my purchased books from Amazon.

I've converted a few to use with KOReader, but I'm running into several books that are unable to be converted due to DRM. So, I'm kind of out of luck with that.

I don't know a thing about programming, but I'm just wondering how much would have to go into it to get this night-mode feature.

I'm not terribly concerned about ghosting, etc. I can't see well enough for that to matter, but I have found the KOReader's inverted color scheme to be absolutely remarkable and just think it would be so awesome to have this system-wide.

Thanks for taking a moment to read this!