Getting a seller to use a non traditional form of payment is going to be tough for a sum that large.
I know nothing about faceplant fake banking, or the vulnerabilities it may have.
I doubt many people do.
Who uses faceplant ?
There was a time you could accept money on Paypal, but no more, as the buyer can file a complaint and have the transaction reversed.
Then they get their money back and they have your boat.
Whats wrong with putting a down payment on the boat and finalizing the deal at a later date?
Many police departments promote closing the deal at a police station, or inside the buyers bank,
you get the $$$ and can have it wired to your bank, or buy a prepaid credit card or a debit card, so you don't have to carry the cash.