Rangers should put out a statement saying something along the lines of
'We agree in principle with limiting the price of tickets for away fans, but our supporters have been ripped off for years (Dundee Hibs as an example). Therefore we will charge all away fans exactly what their club charges Rangers supporters. That puts the ball in their court.
Also, the away club should be charged for a minimum amount of tickets whether they sell them or not. They must give Rangers adequate notice of how many they have sold, so that the allocated area can be made smaller if necessary and the extra tickets sold to Rangers supporters.
I also think the end section of the West Enclosure is the best place for them, but I appreciate the difficulties this would cause.