There is another thread with a similar topic
http://www.enz.org/forum/showthread.php?t=30297
I wrote there amongst others:
"... you may get in contact with IPENZ our professional organisation here;
http://www.ipenz.org.nz/ipenz/. If they stated your education and experience is similar to a Washington Accord degree (or perhaps even just Sydney ... or Dublin ...) that could help.
Al least it helped several years ago with my application. My degree is not directly acknowledged either but I got a confirmation from a member organisation saying that it is the equivalent..."
Not sure if it could work out in your situation though. And of course I thought that - at least parts of - your education and / or experience might originate from France.
Another idea is that you try going to a lesser degree, e.g. technologist or technician. I have no experience with that, it is just something "theoretical".