I would let nature take its course laughingdog. Sounds like they are as healthy as a trout. I live in Canada and have new squabs that just hatched December 28th. I placed a Styrofoam meat tray under the nesting material. We had -16 Celsius temperatures and the squabs are doing fine; their eyes are open now. (No insulation, No heat, No light). I am thinking I may employ a Styrofoam cooler for material for making a shelter when the squabs get to the size they can not be incubated by the parents easily. Pigeons have enough brains not to eat the stuff.
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