Simple solution
collect tickets from the etihad a week before the match where you get a ticket and an wrist band with a bar code which you put on at the etihad
the wrist band has the same bar code as your ticket which if broken stops you getting in ground
cant make the etihad then you go to collection point wherever game is taken place where you get ticket and wrist band
you could even state your choice when you buy ticket online or on phone
collect tickets from the etihad a week before the match where you get a ticket and an wrist band with a bar code which you put on at the etihad
the wrist band has the same bar code as your ticket which if broken stops you getting in ground
cant make the etihad then you go to collection point wherever game is taken place where you get ticket and wrist band
you could even state your choice when you buy ticket online or on phone