I think possibility has practicality implied. If not, I suggest you take yourself off of it and save us all the bother.
Kill files are more difficult in email.
Many mountd implementations don't care about source routing. Therefore, spoof a mount request from a trusted host, source route it through your local machine, and create a routing entry for the trusted host routed through localhost. When the server replies with the file handle, sniff the handle, and your local system will automatically route the reply into nothingness.