Walking the line between actual danger and somewhat light humor could be a way to go. To make it work, both Bilbo and the Dwarves have to believe they are in danger so it cannot be too light or humorous. Maybe some of that can come with Gandalf who observes it all with a slightly cocked eyebrow ready to step in if things go too far. I would get rid of the purse and its ability to talk but perhaps substitute some sort of auditory alarm that would serve the same purpose. The effect is not quite so cartoonish.
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