This is an area where cryptocurrency can actually help. There is theoretically no limit to the amount of "cash" that can be carried in a virtual wallet. As long as the private key remains private, there is no way for the "cash" to be confiscated.

So, instead of carrying $57k in cash, he could just keep a wallet in cold storage and carry that with him. Even if the wallet is confiscated, he can get a new wallet and recover the keys later. There are so many ways this could go.