Given that you can’t smelt down equipment that is being used by any character and spec (a good idea) I think it’d be cool to have a “remove all equipment” button either in the character select screen where you pick your subclass (preferred) or on the character’s specific inventory screen (less perfect but still good). This is purely a quality of life change so that people don’t need to load into every single character to find a wayward trinket, and also to speed things along when you’re swapping characters and want to clear out their gear in case you get upgrades on another.
tl;dr
Put a button on the character select screen that removes all equipped items, replacing them with stock Blacksmith items.