While morally and ethically suspect, is there anything in the reservation/check-in system to prevent one from buying two tickets on the same flight, one refundable in First with its ground amenties like IFL, and then actually traveling on a discounted restricted fare in Y?

Thinking through the issue, one has two confirmed seats with the same name but different PNRs. You check-in online and print your BP for one ticket (refundable F but without MP number) and then do it again a second time for the other ticket (Y with MP number). When you get to the airport you can go through fast-lane security and visit the IFL on your first class BP. Close to boarding you call UA reservations and cancel the first class ticket and then present your coach BP for the flight. Upon return, you request a charge-back for the unused first class ticket. It sounds too easy to game the system this way but I don't know where the process would hiccup. Thoughts?