Just to touch base, it's purely up to you and opinion to feeding in a separate enclosure vs feeding in it's actual one. When I had my BP's I fed them in their tub as it's easier to do that then place them in separate enclosures, especially for the ones who are more aggressive feeders.
I keep two Rufous Beaked Snakes in a 3' x 2' x 1' high and they've been living together for over two years. I feed them in separate enclosures for a few reasons. I do their tank cleaning during this time because they don't poop on top always, so sometimes it's on the actual bottom of the enclosure, so I have to search for it. Also, because when they get in feeding mode, I don't want them to go for the same mouse, or even bite each other. So that's why I feed them in separate enclosures.
Now when I get my WLP, I won't feed it in a separate enclosure, nor will I do that for my new rat snake that arrived yesterday.
So in the end, it's purely a matter of preference. If you feed out of the enclosure the snake will not think it's always getting fed when being taken out, nor will feeding the snake in the enclosure make it cage aggressive.
Yeah I get you - I think I just don't want to be handling a snake too much when it has just been fed. Especially as I've never had one before.