Re: Advise on luring a swarm
just use a single deep hive box with top and bottom with whatever frames you are using with some lemongrass oil as bait. You might be surprised and get one. A single deep box is perfect size for swarm trappers. I've never done bee-lining but read alot about it and a few stories. It sounds fun and might be very productive in finding a hive for you, but it might be in someones back yard like you are trying to do.
I've been keeping a few hives for the past 20-25 years, and no longer treatment free as I got tired of the losses.