I'm not sure that any virtually any backup system would be sufficient for extended periods of unattended operation. Something like propane or an oil stove with enough solar to energize a thermostat circuit might be pretty reliable but it'd be fairly expensive if you intend on becoming full-timer soon. A full time resident neighbour who would check the place regularly would be good and also would be about the only thing an insurance company would buy. It may be a pain but I think I'd just keep winterizing the place until you're a full-timer.

I know somebody who just used a light bulb for your insulated box idea. It gets much colder here but the pump was in a cellar and would get considerable geo heat. Light bulbs do burn out, but the person was a full-timer. Small baseboard heaters are safer and more reliable.

I wonder if geo heat might get by for just the pump house? If the sills are at grade, cement board attached to the sills and buried at an angle away from the building increases geo heat. Something like that combined with a lot of insulation and a black roof might keep it above freezing most winters. But of course you never know and the rest of the place would still have to be winterized. Sounds like you cracked a toilet bowl. Even people who winterize sometimes forget to squirt anti-freeze in the holes around the top of the bowl and end up with a cracked toilet next spring.

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