Putting everything into a 4 door Impreza would be a cinch. You don't even have to modify the WRX wiring harness, except maybe for the door cords and some miscellaneous things like lights. But the complicated stuff- engine, ECU, all the underdash stuff- can just transfer straight over. Heck, even in a coupe you still wouldn't need to do much, because you would just leave off the rear door cords but fronts should work as intended. At most you'd have to do some jumpers on the rear doors where they plug into the main harness. You have to do some minor trimming of the firewall to make the WRX heater/AC cores come through, but it's not major. One can look at my wagon to see exactly how much.
It would definitely be cheaper to buy a high mileage, mediocre condition GC and swap it over than to do major body work on the newer car, but maybe not by a long shot. You'd also have a significantly faster car at the cost of a weekend or three worth of labor and a few trips to the hardware store.
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FWD is the new AWD
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