I don't see why Norwood couldn't wear exactly the same strip they do now, just wear all white when playing away against Melbourne, and Melbourne wear all white when playing away against Norwood.Melbourne would kick up a stink but don't have the same clout as Collingwood.
Not that Norwood have a lot of red on their home kit anyway. Maybe have a Port Melbourne like away kit except perhaps with a red number panel, but might need something else against Melbourne (the AFL loves to enforce white into clash kits).
But I just can't see SA3 happening at less than 26 teams.
It's the same thing with Port, let them wear the prison bars any game they want ffs.
I can understand changing mascots, but not kits except for clashes.
I don't see SA3 happening anytime soon, though.