I'm still kind of a noob at UI modding, but I wonder if an instance of a bag can "see" its ingame settings, like its title and so forth. If so, maybe a default bag could be made with a colored rectangle in the back that only gets turned visible if the bag instance is named, say, "orange". You'd have to hardcode the colored rectangles and for each you'd have to make the code to look for the matching bag name.
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