But you'll have to remove "I'm sure Skylwalker is with them" before the Hoth battle for this to work I think.
I also will have to edit the title crawl where it's stated that Vader's searching for Luke Skywalker and... that's it. That's actually what Lucas had to make in order to make the rewrite of his Palpatine talk work, because in 2004 version it's confusing, how Vader can not know about his son if he's searching for him?