Hi Clive,
I have not done much snow kiting, but I have done a little bit on tele skis. The issue you might have with the hire skis is that they will probably be suited to the groomed trails, and might not even have metal edges on them. (It has been a long time since I have hired Cross Country skis though).
When you kite, you will be off the groomed trails and will definitely need metal edges to assist in control. I run a full tele set up, with Plastic Boots and Telemark Resort skis, or heavy touring skis. I find this works well as it gives me really good control of the skis and I can concentrate more on the kite and where I am going rather than trying to get the skis doing what I want them too.
I would suggest getting at the minimum metal edges and cable bindings for kiting. As I said though I have not done much and stand to be corrected by someone with more experience than me.
Cheers!
Craig.