I don't think it's possible unless Larian themselves decide to officially submit the to PlayStation and give players some means of earning them as PSN avatars. No preorder bonuses for this game that I can see so they could in theory say closer to release that everyone who preorders on PlayStation gets a set of game themed avatars or have PlayStation page where you go to watch some trailers and check out the game editions and you are given a code that unlocks some avatars just because you checked out the game the way Hogwarts Legacy did. But as of now we can't have BG3 themed avatars that I am aware of.
Last edited by Darth_Trethon; 12/07/23 10:33 AM.