If you can tie it down without bending it too much that would be the easiest way, but the top will still try to grow upwards no matter how much you bend it. If you are going to tie it make sure to use a soft rope around the stem as string can cut in and damage it.
Have a look at the pics of my NL, I just updated the thread yesterday. You can see where we cut them, by where my grow buddys left hand is. Cloning is super easy, just make a really angled cut.. pull off the bottom two fan leaves.. dip the cut in rooting gel ($12 from Switched on) make sure you get rid of all air bubbles and plant it into a small pot. For the next week feed it by spraying the leaves with water as it will have no roots drink through. After about 1-2 weeks you will be able to tell whether or not it is going to live or die and then you could either leave it outside or start an indoor grow over the winter.
Good to hear another kiwi is on this site, whered you get the WW from, I have one aswell that is just about as tall as me.