Old laptop at your own place + second old laptop at a home lived in by family or friend would probably work great for this.
Hell now I want to try this with two old but decent android phones - they would sip power and have a built in UPS and would blow a RPI out of the water speed wise. Throw a USB-C to Ethernet adapter on each and setup for HA (or if you were really lazy just a simple round robin DNS setup). Put one at a friend house and have them both setup with the free Cloudflare proxy thing and you would not even need to open any ports on your firewall.
The problem with using old phones is that the battery swells up after a few months left continuously on charge. You could extend the life using Tasker and a smart plug, but you'd lose a lot of the UPS's potential.
Hell now I want to try this with two old but decent android phones - they would sip power and have a built in UPS and would blow a RPI out of the water speed wise. Throw a USB-C to Ethernet adapter on each and setup for HA (or if you were really lazy just a simple round robin DNS setup). Put one at a friend house and have them both setup with the free Cloudflare proxy thing and you would not even need to open any ports on your firewall.