Snakes have been living in the wild for millions and millions of years without being on perfectly sized substrate with perfectly dry prey items. Unless your snake gets mouthfuls and mouthfuls of substrate ingested, you're not going to see an issue. They can break down bones completely, you don't think their stomach acid can handle a bit of wood or coconut husk? My snakes are on reptibark and they ingest substrate, sometimes quite a bit, and I have yet to have an issue with it at all. If they swallow the rat and there's substrate in their mouth still, they're capable of getting the substrate out of their mouth just fine. If they couldn't, snakes would have died out long ago since only in captivity are there humans hovering anxiously with tweezers to bother their snake while it's eating and ready to pluck out that /one piece/ of substrate.
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