Unfortunately they put the A/C cooler in front of the radiator for a reason.

To get the best efficiency out of it it must be in a continuous stream of cold air (remember the A/C is a heat pump, all it does is move heat energy from one place to another, and conversely "cold" energy from one place to anther to better visualise the concept). By putting the A/C radiator behind the coolant radiator you would be reducing the temperature difference that the A/C requires (would only get as cold as the backside of the coolant radiator, instead of the relatively cooler stream of air in front of the vehicle). Short story, your A/C would be a very effective heater.

Anyone seriously considering moving the A/C radiator, don't. I can guarantee that you will be bitterly disappointed.