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You didn't kill them by locking down early. With staggered hatches, I've locked down one or two days early with no ill effects at all. In fact, I've gotten better hatch rates from the younger group, which tells me something, though with that small a sample size, it doesn't tell me too much.
Bantams take the same amount of time as any other, so at 20 or 21, I would just wait, watch, and be patient. Every hatch there is a time that I spend looking at the eggs, sure they are all dead, and in a few hours things start to happen.
But remember, even if nothing does happen, you didn't kill them by locking down early.