K3CAN

I have the older “Google WiFi” mesh and I was able to install OpenWRT on them. You might want to see if that’s an option for yours before spending money on a new system.

This might be a good start: https://github.com/ecdye/zram-config

Libre Office “Base”

Another option would be to redirect logs to a ramdisk. That’s what I’m doing on a RPI to try to minimize writes on the sd card. The biggest downside is that you lose your logs when you power off the device, but if the alternative is not having logs at all, I think it’s still a better option.

Of course, installing a proper drive is still the best solution.