It's not how that works. Do you think there're a copy of every art with each skin tone and hair color?) Add it is easier than you think, but still a ton of work and a big pain in the ass. However chances for it low not because of it, but because MC beard not appear in storytelling ¯\_(ツ)_/¯
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Technically you are right. Each art will need its own beard sprite. But at the same time - it can just be a layer that is added on top of the current arts, like it works in the Darius route. Ger is a talented artist and defennetly can nailded that work. But imho the revisiting all story and dialogues for conflicts of MC appearance with the narrative would stop Dyne from adding this to the game. All I want to say is that the pain will be a not to draw 1000 beards on current arts, but trying to implement and make it work)