I don't recommend flipping the servo arms around. You need both halves to travel exactly the same amount throughout the entire range of movement. Not having this can cause tip dropping and undesired rolling in some maneuvers.

Futaba sells a small electronic servo reverser, the SR10. Its about 30 bucks and you can reverse the servos electronically, keeping the linkages where they should be. You can also use it to adjust the subtrim so you can get each elevator half's neutral position the same.