Couldn’t you put a tamper indicator on the case so if someone opens up the seedsigner to install custom software to do this you would know someone tampered with it by checking the indicator seal?
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Well, I guess you could. My perspective is always the average user that is not following this discussion. My project is WalletScrutiny and when reviewing SeedSigner, I took the "no radio" aspect at face value. Hacks like this make me paranoid about the firmware shipping with some LoRa IoT global network leaking the keys while in use.
I do not think that SeedSigner would do something like that and suspect there might rather be custom hardware wallets that "accidentally" feature much better antennas that later turn out to be sending seeds since years but "won't be evil" is just not good enough. I try to find "can't be evil" or whatever gets closest to that.
WalletScrutiny
SeedSigner
Review of SeedSigner (verdict: sourceavailable)