I have no talent for hardware modification, so I’d either have to find some way to get good at it or pay someone to do it for me. That said, I have also considered this (removing Wi-Fi antennas before purchase was one of the few practical suggestions I found while trying to read up on this topic). Right now it seems like my current plan is easier, but I am certainly willing to experiment with many variations on the basic theme if my initial approach doesn’t work.
Why is this a problem? Drip some epoxy into your physical Ethernet port, break off the Wi-Fi antenna, delete the network drivers from your system...
I have no talent for hardware modification, so I’d either have to find some way to get good at it or pay someone to do it for me. That said, I have also considered this (removing Wi-Fi antennas before purchase was one of the few practical suggestions I found while trying to read up on this topic). Right now it seems like my current plan is easier, but I am certainly willing to experiment with many variations on the basic theme if my initial approach doesn’t work.
You only need to break things. Breaking stuff is much easier than general-purpose hardware modification :-)
Deleting the network drivers, though, is a filesystem operation and will cut off your machine from the ’net quite effectively.