I'm not sure if the bag being burnable is intended. But if so, my suggestion will start from it.
Would it be okay to change the recipe from [ 2 broken shells, 4 grass, 2 seeds ] into [ 2 broken shells, 1 salt crystal, 1 pig skin ]
- Salt is so that it would make sense that it slows down the spoilage of the seeds inside (some people may say seed's spoilage in general is high already)
- Pig skin is because so that it won't be burnable just like the Piggyback.
Those are the closest recipe I could come up with that will go with my 2 concerns for it, same as it wouldn't be as hard recipe just like the current one.
Thank you!