Q: Change logon window screensaver to a Mac OS slide show?

Hey, all!

I'm trying to change the Mac user logon screen's screensaver to be the Snapshots slide show that's in the System Pref > Desktop & Screen Saver settings.  As seen here: 

I've found this support doc on the Apple Support pages, but it only states how to add actual screen savers (listed below the Slideshows section seen above), and not Slideshows.  I navigated to the location mention in the support doc, but the files there only reflect the Screen Savers, not the Slideshows.  ...I also found the Slideshows folder, but they are a collection of files, from what I can see, and not a single file per slide show.  The help doc states that Slideshows can be used, but I can't find anywhere that states what the correct Terminal commands should be.

Here's what the Snapshots folder looks like that I found:

It's located here:

/System/Library/PrivateFrameworks/Slideshows.framework/Versions/A/Resources/Cont ent/Styles/Snapshots.mrbStyle/Contents

Can anyone help?

Thanks in advance!

-=R=-