@Wyldanimal or anyone. Is there a way to flag clips in the clips list as deselected in bulk ?
You can write a Script to search all of the Models Folders
and Find the .demo files
and Add them to a file called inactive.txt saved in the models folder. 
( there is no card prefix to this file name ) 
( one clip name with extension per line ) 
use the scripting Language of your choice.
after you have done this, do a rebuild collection.
After the rebuild is complete, all of the Preview clips will be unChecked in the List of Clips.
I suggest to 
Test it on a single or just a few cards.
then expand the scope of the script for all of the cards.