Ugh...I honestly don't see how they'll pull that one off, cause of Link primarily.
Maybe make it that he doesn't say a word the whole time and every time he opens his mouth to say something, some other character (from his party, since I can't really see movie being about Link going alone on a quest) speaks instead of him or NPC just starts answering with reply that involves Link's supposed (yet unheard by audience) question (like they do in interviews).