EXIF Summary Tool for 500,000 photos?

Unfortunately I don't keep edited photos in my catalog. This would mean I need to rebuild a catalog worth 500k photos. Even with minimal preview, this will take a very, very long time.

It seems to me that this information is readily available through Lightroom's Library module. Here's a screen grab of all my 5 star rated images (I don't use star ratings in general) in my connected libraries (excluding external drives, which can easily be included in this type of search). In the first column I sort and filter by rating and select all 5 star rated images (19 in this example). In the subsequent columns I list focal length, shutter speed and aperture. I can then filter by other star ratings, color ratings, etc.

Here's a screen grab of my LR illustrating what I did. I have a feeling you know this already and are looking for something else. If that's the case, I apologize for misunderstanding.