Use the haka form to practice the body language of other emotions and attitudes: instead of intimidation, how about love, shame, flattery...?
Use it with language, as a kind of competition -- each side having its players say something in English, different for each player, showing off their language skill and clever ideas.
Use it with sounds, each side taking turns making one sound or word, like my name "Matt." The leaders can coach their teams and tell them which word is next.
Show a good haka video of the All Blacks, or the wedding video or funeral video. Talk about the effect and the meanings.
Thinking and feeling create movement, and vice versa (Bruce Fertman)