I know this is not as easy as it used to be, but after discussing, you could split the first post into a new topic or delete the replies, so users won’t see them. To hide the edits on the first post, you could hide all the revisions so they are only visible for staff. Scheduling topics for future publication might be easier because it removes all the edits before moving the topic.
I don’t think there is a solution that removes replies and edits at once.