Hi Dave,
The Eletronic zappers were installed on a 'fit and forget' basis (before my time), except for changing the bulbs once a year, glue boards would be an option as the flies are only active for a short period of time but would require a little more maintenance (but on the other hand, I wouldn't have the beetle problem).
The good news is the beetles are isolated to only a few small areas directly below the zappers, so it'll be a hoover around and a dusting after.