Just to put it into context: I'm a talented translator, I've made my living doing it for ten years, been living in Italy since 91, but I wouldn't touch the dialect of my own region with a bargepole, let alone that of another region.
So here's a different suggestion. Why don't you wait until you're back in Italy (you said you're going back in the summer and you're not in a great hurry), then get someone from the community you're documenting to help you with the translation? I'd imagine that people would like to be involved in your process, it would probably greatly increase your access and integration. Dialect is a huge problem for translation, but on the other hand, people are very proud of it and getting the characters themselves involved would be a great way to show them that you are very committed to what is so particular about their lifestyle and community.
[Start dodgy suggestion] In the meantime you could cut a very short teaser for picture alone, put some music over it and wild track perhaps. And if what they're doing/saying is most likely not of great dramaturgical impact (when cutting up the pig, for instance), then you could even subtitle what you imagine they're saying (like, hand me the bucket, careful not to get blood on your shoes, etc.). This would work for a teaser until you can get the real thing. [End dodgy suggestion]