Matt Denton-Giles did something similar with fern hydroseeding.during his MSc years ago - Massey University. Maybe check out his thesis, and get in touch with his supervisors? I doubt it was published, but I'm sure there was a bit of work going on at the time. Let me know if you're stuck, I can get hold of Matt (he's overseas) if you don't have any luck through the library.
Some hydroseeding was carried out under the SNIPP project in Hawaii (using native plants) some may be the same genera as NZ species. Try contacting SWCA consultants in Hawaii. See also: http://www.ctahr.hawaii.edu/defrankJ/NON_HOMEPAGE_PAGES/Native%20Plants%20for%20Hawaii%27s%20Roadways.htm