Content Categorizing Assistant
This would create a category similar to Products in your Content Library with ALL your Content in it. It would organize it into folders in a reasonable order. And it would highlight anything you have added since the last time it was run.
The Category should be compiled from any directories registered with the DAZ Studio. Content Categorizing Assistant should create it's own database to store this information in, and save it locally. At this time, it could compare the filenames and directories to create a list of things that go together.
The organization is open to interpretation but, as close to the way Smart Content is organized would be the most logical. Also, you're just going to reorganize it anyway. There should be at least two subcategories in the top level: Content and Unknown.
Content Categorizing Assistant could compare the current run with the saved database to decide on any new items added since the last time. It could then either highlight them in some way or put them in a separate folder of the category. It would then add them to the saved database in preparation for the next time it is run.