Could be a hard tail version of the Luna eclipse hopefully with a rear rack and fenders. And I know they know how many people swap the stem and bars for BMX bars.
The bike has a gear shift sensor that cuts power when shifting up or down, I am sure that you could disconnect it pretty easy. It is located nest to the derailer.
My LBS was supposed to get some in in February but they haven't shown up yet. I am in the same boat as you as I have looked everywhere about the system and found very little info and only one review from a fee years ago.
I don't know about getting into the settings on that display but I haven't needed to change anything anyway. To me it is just right right out of the box.
Has anyone here tried the Tannus Airless Tires on your Gravelster or Roadster? Thinking if they work that would make these bikes almost completely maintenance free.