My current understanding:
Copy the Aperture Library to the SSD.
Then open the Library and relink one of the referenced files.
Based on my past experience, all the other files will get relinked because the parent path for all the missing images is the new path that I will use when invoking "Locate images dialog".
Is that the right thing to do?
Is Aperture working with the Aperture library on the clone drive? Are all referenced images now connected properly? Then it should not be necessary to reconnect originals after you move the library back to the SSD, unless you move the referenced originals as well.
Simply dragging your library back to your internal drive and opening Aperture by double clicking the library in the new location should suffice.