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this can come in either a modding api (would require some coding to make a plush) or a resource pack-like system where the user downloads a zip file from someone and the plush could show up in a separate tab or the same inventory tab

This is something I'd like to implement for simple block plushables in future. Once the mod has had a few stable releases I'll revisit this idea, with datapack generated plushables. Thank you for the suggestion 🙂