Dave,
Instead of importing & copying the well used assets, maybe leave them on a place on your network or a folder on your storage device, on import?
“Choose a storage location for the media files:
Copy the files to the current library: Select “Copy to library” to duplicate the files and place the copies in the current library storage location. For information about setting the storage location for a library, see Manage storage locations.
Note: The name of this option changes to “Copy to library storage location: location name” when the current library is set to an external storage location.
Link to the files at their current location: Select “Leave files in place.”
Note: If you select this option, Final Cut Pro creates symbolic links (also known as symlinks), which are special files that point to the media files. If you later copy or move clips between events, only the symbolic links are copied or moved (not the source media files). To replace the symbolic links with the actual source media files, select the events and choose File > Consolidate Event Files. For more information about files and clips, see Media files and clips.”
Just a thought,
Lawrence