How to do a Long Haul Flight

You have the right idea with setting all the graphics low, brightness low, and limiting frame rate. I don’t have the same device as you but I do have an iPad and what I do is set the camera angle to scenic to avoid the game freezing up, settings on low as you said, brightness as low as possible, keep it plugged in. If you are planning on doing an overnight when you are asleep, make sure you turn off auto-lock and turn off do not disturb to get rid of those notifications. Here is also a thread to give you a rough idea on how your device works with infinite flight: Device Compatibility Thread 22.3 - Built By Us For You!
Hope this all helps and have fun!