You're on the right track!
As you can probably see, it's not the end of the world if evil eyes get into the center island beyond the trapdoor, as long as you could theoretically retrieve them.
Trapping eyes behind inactive eyes is the right idea, but doing so will require observation. The place would have to have the following property:
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×Of course, if you trap eyes on the outside edge of the spiral, they'll just come loose, or you won't be able to catch up to them. So you have to trap eyes on the inside edge.
The precise location to trap eyes at is (complete spoiler):
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×(15, 18), underneath one of the sleeping eyes on that edge.
To do that, you'll need to leave some other eyes asleep, so you can lure eyes to (12, 21) to achieve necessary offset.
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Quick links to my stuff (in case you forgot where it was):
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[Last edited by Chaco at 03-27-2016 05:07 PM]