I have good news...
I found a farm auction about 25 miles away, and the owner told me to bring the cockerels tomorrow morning!
They auction the chickens along with their container, so he suggested I bring them in cheap laundry baskets with netting on top.
I happened to have some old laundry baskets on hand.
What do you think?
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I think the best way to get them in the baskets is after dark, once they've roosted.
And the two Dominique cockerels are going, too.
That thin plastic netting might or might not be strong enough to resist a bird trying to break out. But since yours are bantams it has a better chance.
Maybe use two layers?