I don't have a clue about FAR's to be honest.
And I must admit that sort of thing under EU regs I would be a bit chancy on as well.
I have always thought that a CPL could be payed a fee to fly a plane anywhere as long as they don't supply the machine.
Never been in that situation so never looked into it.
Only situation is when a mate/someone asks. Can you shift this machine somewhere. I know I can do it for free with out having to cost share with a commercial license. Its never been worth from a tax declaration or bollocks factor ever charging for a ferry flight.
My bar bill is more than likely higher than the ferry fee anyway