I really can't imagine trying to keep my geese confined, their overnight pen is far too small, OK just for overnight, fed in there at nights, I have a very small field below their hut, they will go in there, with a bucket of water. The frog pond will be covered over somehow.
We don't get migrating birds, apart from occasional flight of geese way up high.
Hens will be in. One trio lives in polytunnel since last year anyway, other trio plenty of space in their 4x6 shed with extra raised platform.
In some ways, it's good that it's over the worst part of the year weather wise. Not fit for them to be out anyway normally (Up here in the Pennines anyway)