One thing I would caution is that a couple days at slightly below optimal temps isn't going to do any damage, a very small amount of time too hot could easily kill. Have heard too many horror stories of people losing reptiles this way trying to keep them warm in the winter. I would aim for 70-75 in an emergency vs 85 with any kind of improvised heating that can't be controlled the way their enclosures can with precision.
We have a generator, before that we had a Ryobi One "generator" attachment for their batteries and 6 batteries we make sure to keep charged. Running a space heater and their normal thermostat and heat tape for a few days would be simple. Doesn't probably help with limited time to prepare but might be something to aim for in the future. I feel like the less changes I would have to do in an emergency, the less chance for something to mess up, so I would prefer to keep them in their enclosures with their normal equipment running if possible.
You should get some water out now before the power goes out because it does hold temperature so well. I don't know what you are working with. Do you have a gas stove in the house? BBQ? Propane camping stove? If you do you could warm water you already have with those. Hopefully a cooler to have some place to put snake in a bag on one end and warm water on the other to keep cozy for several hours at a time.
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