I gave it a very short search back when it broke last year. I went with the cheapest way to get it back up and running which was just convert it to a desktop. She never goes anywhere with a laptop in the first place so there was no need to make it portable again.
She’s retired and just used it to surf the web. A Chromebook would work perfectly for her if she was not dead set of having Excel for her recipes and bill tracking.
I’ve been running OPNsense as a VM in Proxmox for a year on an AliExpress box that doesn’t have ECC. If I might ask, why do you have a requirement for ECC?
Before this box, I ran a Dell R230 with pfSense but got tired of the noise and 40 watt power draw.
I’ve had zero issues without ECC, so I’m just curious about your need for it.