Crafting potions, scrolls and ammunition would be great. They're about the only things worth crafting in tabletop anyway, unless you have a huge amount of downtime. Would also make Arcana more useful, than the handful of times you get to use it so far. In 5E you use proficiency with Alchemist Kit for potions, but you could easily replace that with Nature – again a skill that's rarely useful in BG3.
