All of that is to say that Captain America won’t stay Hydra. There is literally no chance. If DC Comics walked back Green Lantern Hal Jordan murdering the entire Green Lantern Corps it’s fucking child’s play to walk back Steve Rogers saying ‘Hail Hydra’ (and even kicking a D list superhero out of a plane). In fact I would say that the main premise of this story is to see how they get out of it, just as it was when Superman or Cap himself died in the past. The initial event/reveal isn’t the story – it’s dealing with it that’s the story. Every single time. This is how serialized superhero fiction works.
This seems the most sensible take I’ve read today.