I. too, am a wildlife photographer. But the blind idea won't work here. I live near two large bodies of water, the Indian River (aka Intercoastal Waterway) and the Atlantic Ocean. And that's what I shoot; water birds, of all kinds.
And I shoot MF on these birds. So there is no AF noise.
The birds I shoot are somewhat used to people being around and I walk slowly into their space, stop and wait. I need longer glass at times too because of where these birds are standing, wading, eating or nesting. I have two longer glass than 200mm, one is the Sigma 70-300mm APO/Macro, non DG, and the other is one I just recently bought from the Market Place here, a Samyang 100-500mm A lens. Below is a shot taken just recently with the Samyang lens:
Location, in the river, an island called Bird Island.