I came here just to say this too. They don't need to reinvent the whole wheel again. In this case all it is needed is to change the screen and add the Electrophoretic Display Controller. That would be the most efficient approach.
In the previous discussion, I also learned about RLCD which I vaguely knew about when Qi Pixel was a thing but it seems to have improved. So one of those for the frame.work too, and all is good!