<I understand that old comb that has a little nectar on it works very well
as a bait but you need to make the comb a bit wet first and leave it for
two or three days so that it starts to ferment. >

Thinking out loud here again, if you intend to bait a trap with comb, why
not use the hive as the trap instead.  You could make a screened off trap
that fit on the top or bottom of the hive and used the colonies own
pheromone as a lure.  I have screened ventilated covers and have noticed
other bees poking around them occasionally, though no trouble with hornets
ths far.  It wouldn't be too hard to convert one or more of those holes
into a one way hornet trap... though you might also trap robbing bees.
Good luck in any case, let us know how it works.

Jeremy
West Michigan

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