This workaround assumes that the data for all websites created by your machine are on your USB stick. (For management of multiple websites, see this older hint).
First, generate your website with iWeb. iWeb stores all information in your user's Library » Application Support » iWeb folder, in a file named domain.sites2. Navigate to this file in the Finder, then:
- Copy the file domain.sites2 to a USB stick.
- Create an alias of domain.sites2 (will be called domain.sites2.alias) on the same USB stick.
- Do not open iWeb.
- Erase the file domain.sites2 in that Mac user's Library/Application Support/iWeb folder. Keep a backup of this file if you're going to want to replace it when you're done!
- Copy the file domain.sites2.alias from the USB stick to the local machine, into that same directory.
- Control-click on the copied alias, and select Open With » iWeb from the contextual menu.

