I'm figuring that folks have already found/figured out the delete-and-redraft function, but in case you haven't: you can literally remake a toot without needing to re-write/copy over/re-upload the content! It's in the post options menu next to "delete".
It can't carry over the notifications you had on the original post, but I think that makes sense since it's basically making a new post. Bottom line: making fix-it posts after you notice a mistake in your piece is that much easier! 👍