Those are great ideas
The area we put them in has never had animals in there before so that should be fine. I did check the birds over before purchasing them and they were all very healthy. And they came from very healthy farms with knowledgeable owners.
I like the idea of preventative control rather than treating the lice/worms/etc when they appear. Just out of curiousity, if I treated them as a precaution for worms and it turned out they do have them and they are in their permanent home, would I have to strip the pen after a few days to avoid reinfection?