Here's a thought. My wife wouldn't want to go outside to ponder what to defrost next, and neither would I. But you can easily convert a free discarded fridge into a freezer that is placed indoors, but out of site (garage, basement, etc) Take the compressor out and set aside, you'll just be using the free fridge as an insulated box. Set the fridge on its back with the long side against the wall, so the door lifts up like a laptop computer opening (with a pulley, cable and counterweight to make opening easier?)
When your outside night temperatures are consistently below freezing, clear out your kitchen freezer (if you don't open it, it shouldn't cycle very much) and put the food in the garage fridge. Put several jugs of water in with the food. Cut holes in the old top and bottom of the fridge (which are now its left and right sides) and run insulated dryer ducting from the fridge through the wall.
You can make a small "toy" VAWT to spin a shaft that turns a fan blade to pull in the night air through a screen. Salvage two bi-metallic springs from the intake air filters of a 60's/70's truck engine. During the 5 minutes it takes for an engine to warm up, the carb air is pulled from a duct that gets air from a sheetmetal shroud over the cast iron exhaust manifold, this warm air prevents the carb throat from icing up. After the engine is warm, the bi-metallic spring uncoils from the warmth, turning a shaft that rotates a butterfly and makes the carb suck cold air which is denser (more power).
It should be easy to "clock" the mounting so the coil shuts a disc in the duct opening when the temp rises to +32 degs. A "stop" can prevent the disc from rotating beyond shut no matter how warm it gets, and another stop can prevent it from rotating past 90 degs open no matter how cold it gets.
When you open a "top-opening" fridge, the cold stays inside instead of flowing out to cool your feet like in a common stand up model. During the day, the frozen water jugs should be adequate to keep the food very cold.
Fridges are real "Watt-hogs", and half the juice is used for the constantly cycling "auto-defrost" heater (the melted ice water runs down a tube drain to a floor pan to evaporate). There's gotta be a way to bypass this function until the kitchen freezer is heavily frosted, and then use it "just enough" to clear the frost once a week?
If you don't want forest air in the fridge (skunks, insects smaller than inlet screen holes, etc) you can cycle the outside air through a salvaged 18-wheeler turbo intercooler thats placed in the cold box, its an aluminum air-to-air heat exchanger.
The old fridge compressor doesn't put out much pressure but a useable amount of Hydrogen can be put into an old 100 gal propane tank, H2 acts like natural gas (C1H4) when burned (bar-b-que, room heater, water heater, etc) You can get H2 by putting excess amps into water.
BTW this is my first post here, this site is truly wonderful. I'm just an old truck driver, so please be kind when I occasionally pop my mouth clutch before I've engaged my brain gear. -Ron