http://www.mpi.govt.nz/importing/pla...-to-importing/
I tried to look into some of your rules in the above link. Tomatoes are
solanum lycopersicum in the rules. It says "assessment required."
If I were you, I would start contacting your relevant government officials. Try to get through to someone who has the authority to waive the requirements, or sign off on the required assessment. I'm sure they will say no, at least at first, but keep asking. Be a very polite pain in the butt is how I deal with government workers. I can usually get someone to help me, even if it is just to make me go away and stop bothering them.