Install locally as usual then edit the registry, and notes.ini to point to the data directory on the network. Then copy the data directory to the network. General Disclaimer: This is not a supported configuration etc, etc.
The only thing is that I cannot specify program path in the install and it wants to put itself on the same path as the notes client. So maybe I am forced to uninstall the notes client, install notes admin designer client and then reinstall the standard notes client on a different path?