Steve,
Thread drifting here but we had an A320 on lease to us through the summer with the refuel panel mounted on the left wing. First one in 20+ years I'd ever seen. Still has a refuel coupling on both sides, refuel ops exactly the same as wing/body mounted panel. The only issue was when the aircraft was parked on a stand with a refuel pit on the right side only, then you had to remember to take some steps with you.