Volkswagen multifunction display – how to customise
VW SAFARI

I’m trying to customize my Volkswagen’s multifunction display. I mean the instrument cluster MFD, not the satnav MFD. It seems like certain menu options come up when you plug in OEM accessories, such as a sat-nav.
As far as I can tell, the sat nav and other accessories supply information to the MFD by means of the CAN bus.
I was wondering if it would be possible to make a sort of homemade controller module to be able to feed anything I wanted to the MFD. For example, to add my own screens or control screens that are already there but not accessible.
I suppose the question is if I can figure out what messages are transmitted to which models on the CAN bus to control the various menus.
Does anyone know if this is possible or tried it themselves?