I have used PocketBook touch lux 5 but the screen cracked twice. (User error but still, screen is a weak link)
KoReader made it so snapy I couldn’t believe it at first.
Now I have got kindle as I received it as a gift, so I jailbroke it and also installed KoReader on it.











Step one: Buy 2000s car.
Step two: Converted it to EV.
Step three: Done!
There are business made on this promise with more or less benefits of economies of scale.
You can find videos how people do it on YouTube.
Example: https://www.fellten.com/system/mini