My derpy little garters like to drag their worms through the coco fiber sometimes. It's never hurt them, just mildly annoyed them. They seem to be attempting to clean the worms off on the coco fiber which does NOT work. They poop plenty despite this. A snake that is well supported (proper digestion temps) won't be bothered by a bit of coco fiber.
As to regurgitating from stress from the brief handling you did, if he didn't do it at the time/pretty immediately after, it's highly unlikely that he will. That type of regurgitation is a defense against predators - they get rid of the meal weighing them down so they can run. Doing it after the predator's gone away for long enough for them to decide they're ok without fleeing isn't a benefit to them and just means they lose their meal for no reason.
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