Nope, the q-tip swab only works if the gapes are actively spilling up out of the trachea when you do it... usually by then they are aspirating and/or dead... I don't really want to lose anymore... but I am 99.9% certain our issue is gapes... thought I lost a Legbar hen, cockerel, and 2 Am hens to heatstroke this summer... the hens all laid an egg, stepped out of the coop and fell dead... once it cooled down I noticed the lack of activity in everyone I had earlier attributed to the heat... after a Call duck almost choked to death in my arms, I dewormed her... by day 3 of treatment she was 100% better, but I finished the 5 days... the 2nd day, I had an OEGB with her head hanging, literally dragging it through the dirt and rocks... neck and head were purple from lack of oxygen... I was scared I had a respiratory issue... but I put her on the same deworming course as my Call... the next day she was holding her head up, color was back and she was eating, drinking and talking like nothing had happened... most of mine free range, but I still have to keep them on a strict deworming regiment... I understand they reingest the worm eggs expelled in their poo, but if they don't get the full course of proper dosage of dewormer, it just takes out the weakest worms and what is left can build up resistance to the dewormer...
Good luck on trying the tarps, but if rain can wash surrounding dirt into the pens worms will crop back up... not to mention tracking them in on your shoes/boots, etc... keeping them on wire 24/7 is about the only way to keep them completely worm free...