Remember that in the clause it is specified that he cant refuse to return to real madrid if they pay us the money, whatever the reason.
Our only chance is if he really convince real madri to let him stay and real gets softhearted. But that clause they inserted is exactly to prevent us snatching him for them. The least they can do is that if morata is unhappy with the move, they resell him, which it seems is exactly what they are planning to do.