there is no such script.
what you could do: manually set both hostnames (prod… and the rtnl…) in your flashimage to the original value (both values are the same in a patched image 
) and flash the original CA certificate which you can download from boxine (there should be a script… → Toniebox not connecting to TeddyCloud - #8 by marco79cgn)
If you set up a new TeddyCloud, you could also use the same IP/Hostname again and also copy the whole server certs to the new instance. so there will be no difference for your toniebox.