Send your page layouts as high resolution bitmap or jpeg images on CD ROM, or take them in that form on a laptop for them to view. All they can do then is print them out.
I often demonstrate site layouts using this method and ,depending on the image format you choose, you can inlcude hotspots on the file to show where hyperlinks would be to other pages.
If you do arrange to visit them there is nothing stopping you from demonstrating complete sites to them from a laptop. It will be your site(s) on your PC and because of that they won't be in a position to swipe the pages.
Good luck with it.