There has to be a simple solution to this one.
Without digging around to find the details of each incident, and the Wx conditions occurring at the time of each one, could you not put a large illuminated 'L' and 'R' somewhere adjacent to each runway's approach lighting system?
I was thinking about the large LH and arrow that was painted on the Southall Gas-Holder when EGLL had R/W 23 and Pan Am landed at EGWU in error. As far as I'm aware, it never happened again?