I dont see what you would have to loose by putting the dadant out as a bait hive, just the brood box would do. About 150m from your hive and at least 2m high if you can plus a bit of old comb inside would help. Other wise its just in your shed collecting dust .Most French beekeepers I know seem to me at any rate stuck in the honey equals money equals new equipment equals more hives equals more honey mode . Where swarms are to be avoided as it is thought they reduce the amount of honey . Oh and regular inspections to prevent swarming and treatment for verroa every fortnight . and complaining about Asian hornets while spending hours at the market trying to sell your honey
Me? I have only been having bees for three years .I was given one dadant and bought one the others I made from scrap wood . I only have two occupied hives but I have never lost a hive nor have I spent more than 100€ over these three years .This year my target is to collect two swarms and maybe a little honey in August . Lets see how the girls do . I dont inspect as there is no point as I do not treat . I am sure they have had swarms I have missed . I check on the bees regularly watching their behaviour at the entrance - the bees are on Colza at the moment unfortunately I would prefer they were on my apples but being mostly adolescent girls you cannot tell them anything

. They seem clean and hygienic not much sign of deformed wing virus , no sign of robbers , no asian hornets only a couple of european ones in ther garden and as busy as well .... bees .

no Drones yet which I take to mean they are not ready to swarm yet .......
Here is the link to the Warré beekeeping site
http://warre.biobees.com/ . I actually run my dadants like Warre with bars and a quilt on top for extra insulation. I dont nadir them though as they are too heavy .
David