If I'm not mistaken, the A320 has NOSE landing lights as well, correct?
So why not just use the nose landing lights at night with the MAIN landing lights inop (under the wings.) We used to do this on the MD80. Some captains did not like using the wing retractable/extendable landing lights at night because of the vibration one felt in flight. So they would just use the nose landing light, which was plenty bright when selected to the BRIGHT position. Plus the wing landing lights did not illuminate the runway that well, since they were so far outboard under the wing tips.
Just an idea.
73