New Zealand needs to stop trying to force middle order batsmen into the opening role. Fulton, Marshall, Vincent et al. are not openers. They will always get out cheaply. Fleming could fulfill one opening spot, his average there isn't too bad (about 35 I think), though it may be a waste given how well he's been playing at number 3.
The other option is to find the best domestic openers, and give them a run. The list isn't very encouraging. Papps, How and Bell are probably the 3 best options, which really doesn't say much for our strength in opening batsmen.