Here is an Armenian duduk group doing the sort of thing I had in mind:

http://www.youtube.com/watch?v=M590Lcrozo8

Here's the score of something vaguely related to what they're playing:

http://www.duduk.com/sheetmusic/Aravot%20Luso.pdf

(I have never heard crumhorns used that way, but if you can pull it off the effect will be amazing).