It seems such a chore when installing a new configured node onto the network to then have to run a discovery, which, deepening upon how you have your discovery profiles configured, can take hours!
As a new node will be configured to send traps/logs back to SW, why not have SW do a discovery on this unknown node(s), or at least flag it up in the same way a device transmitting netflows is detected, then you can simply add the individual node(s) automatically...