This might sound weird, but I actually make little songs out of my 12 word passphrases in order to remember them. Its very effective. For example, my KeepKey Passphrase is sung to the Old Mcdonald had a farm tune, and is therefor called Old Mcdonald had a KeepKey, Trezor, Paper wallet, Exodus, etc. Point being, delete your wallets and just recover your wallets with your songs once you are done traveling. They do not come out of your head. Also this is a HUGE IF it gets to that point of invasion of privacy. A solution will be made immediately. Those old dinosaur lawmakers cannot possibly keep up with the pace that the technology is being developed. Its like trying to stop a sandstorm with chicken wire. They will eventually see the futility and stop wasting the money to try and stop it. Just my opinion.