Further to our resident guru Corporate Wage Slave's advice, if there has been a schedule change or something materialises which would allow a free rerouting then swapping to an AA service to LA with a connection to Vegas would probably get you the match live on the in-flight entertainment. They have live TV which includes 2 or 3 sports channels that show live premier league matches and presumably also the champions league final.
I wish you good luck finding a solution but unfortunately I can't extend that to the result!