Something I would never do....
Just file under a different call sign. Take off, use some random call sign and then cancel in the air. If you do an approach into an uncontrolled airport, they wouldnt be any the wiser, and if its controlled well you could risk that the tower doesnt pulled out the binoculars (I know some 172s that have tiny writing) or just that once use the right call sign.
I could see getting charged for a fee and then someone complaining that they werent even in the air at that time.
Use any "ER" suffix callsign......