I can't come close to answering your question but one thing you might want to look into is how well the Kindle app works on an e-ink tablet. I haven't read or seen anything about this recently but I know there were reviews of Android e-ink devices a few years ago that were able to run the Kindle app and there were problems. I don't remember what problems or how bad they were, but before you go too far with this you might want to research that.
The Kindle app is designed with an LCD or AMOLED screen in mind and those are very different than e-ink. It might be that by now Amazon has taken that into account but I'd want to be pretty sure.
Barry
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