AOPA offers an excellect Escrow Service. ANYONE who is not willing to share the cost of an escrow service is going to rip you off, PERIOD.
Basically, both parties agree on how the transaction will take place. They put this in writing (Escrow Instructions) and give it to the Escrow Service.
When all the conditions have been met, paper changes hands.
If I was going to ship an aircraft overseas. I would limit my responsibilitiy to putting the aircraft in a container (Maybe not even that). When The container is sealed, I've satisified my escrow responsibilities. The container doesn't move until I have been paid in full. These would be instructions I would sign up to.
It would be up to the buyer to arrange broker, container, transit, import into his country, insurance, etc.
BE CAREFUL, There are a lot of SCAM artists out there.
Waiter