Method of changing default VMU image?

[BrochachoTheBro]

By default, when a VMU is inserted into the controller when connected to the adapter, a Raphnet logo is displayed. Is there a way of changing this default image to something else? Could such a feature be implemented into the Adapter Manager? I asked on Reddit and someone said I could build a modified firmware, but I have no idea how to build code at all...

(note: I'm not asking for full fledged VMU support for things like emulators, I just want to change the displayed image to something else like one of the static Sonic Adventure icons)