Dear Lee Hauser,
1. BT Keyboard should be possible
2. I don't have this device, but I have other Boox devices and that worked very well
3. You have Google Playstore and there should be Koreader available
4. It's a little bit darker compared to the older 1
Have a look here , there's some videos comparing older go devices
https://www.youtube.com/@davidtablettech/videos