You can thank Maxwell and Bros (Blockstream) for Rube Goldberg "tech" of SegWit, SideChains, and Lightning Networks, all of which will force centralized control over the validation of the block chain.

666 on a silver platter courtesy of Blockstream. Who also appear to be colluding with the Chinese mining cartel. Do you think they were given $76 million in funding by the banksters to do good for us. Come on. Grow up.

Instead of your pie-in-the-sky delusions, brain readers are not yet that practical. The 666 system may come eventually but I am referring to what we can do now, during the coming global sovereign collapse into totalitarianism.

Also it is not likely you can permanently remember a Bitcoin private key, so a hypothetical brain reader would be even more impractical. You would memorize that for the duration of the travel, and if you forgot, you'd return to re-memorize it. If you trust your traveling companion, they would memorize half of it, so neither of you would ever have memorized the entire password, but that might make it more likely that each of you would memorize the shorter password for a longer duration.

I think there might be an even better way. You'd encrypt your password to a public key. At the destination you'd decrypt it with password you had stored at that location. Or just spend the Bitcoins to the new destination address. The point is don't travel with your passwords to large funds.