I'll be interested in how that works out. We don't have that issue, because we take the regular feeders down before the bears come out of hibernation (per advice of the Dept. of Fish and Wildlife) and don't put up the hummingbird feeders until later (put one up yesterday, just in case)

Those little hummers are mean as snakes to each other. The only thing I've seen them shy away from was a yellow jacket. And then they don't go very far.