Are you saying that you will never have those laptops on the same network as your ADNM server?
Once you push the client out to the laptop, it inherits all the settings, and should work fine. But, if the laptops never touch your domain, then I guess you can't control them...
You should be able to have them connect to your network via VPN at least, and push the install from there. It might take a bit, but it will work...