Something that can help customs be more highlighted is that they can have their own quests connected to their background that origins won't have. For example a scholar finding a book and has to go through means to do it and talking to the npcs for it could give some backstory (to our character, motive, and maybe relationship with the npc in question) that we choose via dialogue. Could also just have npcs that our character would know in general from our background, a group of caravaners we may have met if we were a hermit. Something that would ground the customs a bit more
