This is a strange one because I have recently changed my Quad front pads without any warning lights being displayed whatsoever.
Because of the "brake by wire" aspect of this car I probably would have avoided changing them myself until I saw a video by Auto Fanatic who was trying out different pads to improve brake feel. He addressed the issue of the system being electronic and said that having consulted a couple of Alfa techs there was no requirement to disable the system for a front pad change. Right or wrong he appeared to suffer no difficulties, even though his new pads had no wear sensor connection, so suitably emboldened I went ahead and changed my own (OEM).
I can't really see how the car would know you are changing the pads, and therefore take offence, unless perhaps by deactivating the parking brake in the service menu it then requires some other compensatory input. You do have to re-initialize the system in the menu afterwards. I didn't deactivate the parking brake so I don't think it knew.
I realise this flies to the contrary of everything in this thread so far, but that's my experience.