It sucks when the swarms are in the heart of a tree or bush. It's so dense that shaking or whatever you normally try won't work well. 30+ feet, yeah, next time walk away unless they are on the edge of the tree where you can rope and shake with bees falling to the ground instead of another branch below them. Or you can call Emil to climb it. JP might lend him to you. :-D
I don't think a bucket on a pole would work in this situation. Perhaps a bee vac with 40 ft tube. :-D