You remember when Jack Ryan was trying to figure out how Captain Ramius was going to get the crew off the Red October? Make them want to get off?
You didn't mention fees. Figure out what it would cost to create a record for each person making a cash payment that would flow into your CTR system. Require their identification, record it, and ask to see it every time a payment is made. (In other words, do this right.) Then add a nice profit margin for the bank.
He'll get off the boat.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.