You'll probably have better luck in the Farm Life forum, or poultry if there's a forum.

For what it's worth, I'd toss them outside in a safe place, bright sunshine, and not let them back in until this phase breaks. I've had two hens die because they were so determined to set.

Put them in a wire cage, under a tree. Something like a milk crate, or anything with a wire bottom. Raise it off the ground a few inches so that the bottom is uncomfortable. Make sure they have ample fod and water, wild birds may eat it all-) Takes about three days in jail!
If this isn't possible for you, then follow the last suggestion, lock them up away from the nest, may take a little longer.
We had a goose sitting on a nest outside in the back yard, one year when we had a small flood. She floated off, swam back, floated off. We took the eggs but it didn't make any difference..floated off the nest, swam back, floated off.