Isn't that what we already have...a SHB trap, except in the hive? We know the beetles are attracted to the hive already....
They are nimble, they won't fall in unless you make them somehow. And I'd guess they are more attracted by the smell of fermenting honey or stressed bees.
-Rick (mr. wet blanket
I actually prefer winter...I find lots of dead ones on my SBB inserts.