It's probably horribly expensive to install, but having something similar to the glideslope reds&greens but aimed more at aircraft lining up on the wrong bit of tarmac might be worth considering at some airports. Just arrange a bank of lights so that they are visible as a big arrow pointing left or right when you're lined up on the incorrect taxiway. It still won't stop the determined from continuing, but some might at least get a clue.