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No matter how well-insulated, you MUST have a source of oxygen or you will smother the eggs. I don't think they can be closed up for 3-4 hours safely without access to fresh air.
And then you have the flamability issue if the keronsene lamps are used for longer outages.
Since there are veins in the duck eggs, there is proof that Mulia's current bator system is working. It's not perfect, and a great deal of work to maintain. As much as I'd love to make this easier there is no way to do so quickly enough for these eggs. So... maybe the best thing is to offer support and suggestions for the current system?
Mulia, some people put their egg shells in a pan and bake them for a few minutes, just to make sure they don't taste like fresh egg shells, and to kill any bacteria that might be on them. It's a personal choice. I don't bake mine thouh, but rinse them and let them air dry before crumbling them. I don't have a dog, but whatever scraps the cats don't eat from our cooking go to the chickens, also. Even meat scraps. The chickens fight over meat scraps! They don't get very much of the scraps, though.
Yes, leave the eggs for a few more days. Maybe they are going slow because of the early temperature troubles. But if you still don't see action after 3 more days, then you should probably cook them for your hens.
Do the chickens lay eggs in clean places? If not, then I'd get them used to living in a coop part of each day. I let me out late in the day to run around, and that makes them use their nice clean nest boxes for the eggs. After a few weeks they will always go back inside the coop to lay their eggs in the nest boxes. Another advantage to having them in a coop s so that someday, when you have young birds, you can let them play in the yard for a while without being pecked on by the older birds.