I have found that Torula Yeast works very well as a wax moth bait.  The state of California uses it in Mcphail traps (glass traps containing a bait solution) to monitor for fruit flies like Medfly, Oriental Fruit Fly, etc.  It is a broad-spectrum lure.  A couple of tablets in a pint jar of water works very well.  The only problem with this bait is that I don't know where you could get it.  If your local agricultural commissioner is using these traps, they may give you a small amount to try.  They are used in Southern California and coastal counties up to about the Bay Area.  Bananas and vinegar are more available but I thought the banana would get too funky too fast.  The yeast solution never does.  
 
Bob Roach