I understand what you are saying.. but here is a slightly different way of asking for what I need.
I have the live cd ISO image fully configured with a desktop shortcut pointed to the specific IP address that all servers will be on in the real environment. I also have the key of my testing and proofing environment. In my live environment, all my servers are already on the correct IP address, but I need to make the host keys on all of my servers identical to to my test environment because I can’t change the config of my client once I have “locked” it in in the ISO file.
I realize the security aspect of this, but in my environment limiting the client side from all ability to be tampered with and change is, by far, the bigger security concern.