Do you or friends have old, leaky, big round stock tanks? We used old stock tanks to brood our layer flock. I'd ordered 25 show birds. . .got hot. . .said they couldn't ship. . .ordered hatchery birds. . .and ended up with 52 chicks instead of our planned 25. We had access to leaky stock tanks and we did put a tarp under the the tanks so any leaks wouldn't foul the concrete in our shop.
We used wood chips in the brooder stock tanks. We had to completely clean them out a couple of times a week. We had three stock tanks. One for each group of 26 and a spare. We'd clean the spare, set it up, move the chicks to a clean tank, clean out their filthy tank, . . . .and so on. Since these chicks are supposed to just eat, the big, round stock tanks might work for you.
We're using wood chips (pine), stall dry, lime in our coops for the winter. . .might make a good mix for fast growing poopy chicks to cut down on odor. Just a thought. . . .