Wow, how long have the two broody hens been off the nest? Even if it is a lot of hours the eggs might be OK in your heat.
Option 1: Put a lock on that nest and put one of the broody hens inside. Lock her in there in tight space so she has no option but to stay on the nest. Screw a piece of plywood over the opening as a lock. When she hears the chicks chirping inside the eggs she might revert to incubation mode. Maybe she will at least keep them warm. I'd leave her locked in there for a full 24 hours before I let her out. I don't think the odds of this working are great but maybe.
Option 2: Make a hatcher. Put the eggs and a light bulb in a shoe box. Use a thermometer and try to get the temperature around 100 F. Maybe you can regulate the temperature by how big a crack you have with the lid. You can try putting a bowl of water in there or maybe wrap the eggs in a damp paper towel. Again, not a great option.
Option 1: Put a lock on that nest and put one of the broody hens inside. Lock her in there in tight space so she has no option but to stay on the nest. Screw a piece of plywood over the opening as a lock. When she hears the chicks chirping inside the eggs she might revert to incubation mode. Maybe she will at least keep them warm. I'd leave her locked in there for a full 24 hours before I let her out. I don't think the odds of this working are great but maybe.
Option 2: Make a hatcher. Put the eggs and a light bulb in a shoe box. Use a thermometer and try to get the temperature around 100 F. Maybe you can regulate the temperature by how big a crack you have with the lid. You can try putting a bowl of water in there or maybe wrap the eggs in a damp paper towel. Again, not a great option.