I don't consider stuck substrate to be a problem. As long as your substrate isn't sand, or sharp, I don't see a huge issue. When I feed F/T I thaw the rodent in a zip lock bag so that the rodent itself is dry when I offer it. Snakes routinely ingest small amounts of dirt, sticks, leaves, or whatever else. I rarely use the "it happens in the wild" argument but in this case I think its a matter of weighing the pros of aspen or cypress bedding vs the cons of newspaper substrate.