He'll probably be fine, just keep a good eye on him and I bet he passes it. My Tonks is a little bitty girl and a few weeks ago she got a HUGE mouthful of Eco Earth. I got as much of it out as I could (that was fun) but she still swallowed a lot of it, then ate her lunch like normal. I never noticed anything unusual after that.
I don't take my snakes out of their enclosures to eat, but I do something to make sure they get as little substrate as possible. For my ball pythons, I turn their hides upside-down and feed them in the "bowl" it makes. My bullsnake has a little cat water dish that I put his mouse in, as apparently dangling it for him is TERRIFYING. So they're all eating on a non-substrate surface, and I've never been bitten during feeding time. And I wouldn't worry about your little guy mistaking your hand for prey, unless you're putting a hand near him that smells like prey, which yeah, don't do that.
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