Thanks for the reply CK. I am also wary of a hole in my building envelope. I'm considering the window to chute/slide idea mentioned previously. The reason in my mind for some sort of chute is to get the food scraps farther away from the exterior wall, mostly so it's not a consistently damp place. My compost bucket often contains water from rinsing out my coffee apparatus. Without a chute, I'm not sure I could throw the bucket contents well enough not to just have a sloppy wall. Maybe a better solution is a small compost bucket on a broom handle.
Only half joking.
My compost pile does pretty well for what I want from it with limited interaction. I imagine this routine would involve periodic raking of whatever the chickens pass over into a more conventional pile, so it would get an occasional inspection.
Very interested to hear from someone that's tried it to see if they gave up after dealing with a residue-y chute like you point out being a potential problem. I should probably just give it a shot and report back.