Hear you, I hate BUG especially the biting kind :mad: Know exactly why you're being precautious. You could alway use the "old" as a hospital or for more chickens ;) From my reading, it's like last year we all had mite issues and I'm "blaming" the weather.
You got it figured out for the...
Sounds like you'll be putting your new chicks in with your flock? Will you have a sectioned wired off so the older ones can't get to the chicks? Where are you located? Have you a heat source for the chicks?