The little house traps worked well for me... just leave the bodies in the jar. They do have a strong scent that attracts other carpenter bees. Other than that, only a hand to hand combat war of attrition seems to work.
In NVA I’ve seen one Robin with the condition. Butterfly population is definitely way down. Haven’t seen a honey bee in years. Plenty of spiders, though. I leave them alone in the garden for pest control.
Carpenter bees definitely send a signal. If I swat one down with a badminton racket I will see more come and buzz around it.