Just thought I would put this out there, I made a python package for your Adafruit_RGBmatrix driver that allows users to run off target on their computers so they do not need the hardware to do testing. All it requires is tkinter and pillow.
https://github.com/cujomalainey/matrixtoolkit
See the readme for the very tiny changes to the interface. Included is a picture of the nextbus project running in simulator.
Just thought it might be something useful for your customers to develop with.