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.