I haven't tried PDZ as flooring, but I'm pretty sure the chicks will eat that too. I use PDZ out in my run, mixed with sand, and the pullets try to eat the PDZ when I put it out to freshen up the sand. Really, baby chicks will try to eat anything, like human babies.
My solution was using fine sawdust shavings in the brooder. I'd put in about a half inch of the sawdust, and pack it down. Then, I laid paper towels in several layers on top of that, tucking the paper towels down over the sawdust around the edges, so that no sawdust showed. When I did fast daily clean-ups, I'd remove the top layer of paper towels (keeping the bottom layer of paper towels down) along with all the poop, and replace them with a layer of fresh top paper towels.
In this way, the chicks had soft padding to walk on, the pine shavings absorbed any moisture on the bottom, and the brooder was kept clean constantly with the removal of the top paper towels and poop. Be warned though.... this method uses a LOT of paper towels (like, around 10 rolls of Bounty paper towels for 5 weeks).
But, I must have done something right, as I never had a single case of Coccidiosis, my chicks never got manure balls on their feet, and the brooder was nice and dry and clean.
You could do the same thing with paper towels on top of PDZ, so that the chicks can't eat it, but I personally think the pine shavings under paper towels keep things cozier. (or better yet, use both the PDZ and pine shavings, with the paper towels on top!!)