Filter on high iso photos

Hello, 
I have been using FastRawViewer on and off for the last few years.  A new camera with more possibilites has renewed my interest. (Nikon D610).
 
Is it possible to sort by ISO value or filter photos with high ISO. The  reason for this is that I would like to process the high Iso photos different as other photos. Normal workflow is using caputure NX-D -> JPG (for photos that are good enough).  I am going to use Topaz AI for high ISO photos.  As I need to work in batches to speed things up (after a holiday) it would really help I  can seperate the two workflows. 
 
I have tried to find it myself, but couldn't find anything.
 
Kind regards,
Vincent