I was worried about that with my first small hatch too. I personally would look around for day-olds too, or at least very young birds. I think it might be hard this time of year, although I guess I do still see them on craigslist. Where in SC are you? I'm in Charlotte, NC--I have some not-quite-week-old ducklings and could probably part with one as a companion--of course, ducks are not chickens, so it's not ideal. But if you run out of other options...
Hopefully it won't be necessary, though. Sending you good hatching vibes!!