A few years ago I was an F/O flying charters flights mainly to Greece, and to avoid delay due to CTOT restriction at destination, the company started to change the destination with the alternate !
Then approaching the destination request was made to proceed to the alternate which was in fact the destination !!!
Worked for a couple of month, then ATC filed a report and the company did stop !
I have to say it wasn't a great feeling for us !!
cheers .
Dj.