I needed to use my plugin for another project, so I decided to go ahead and update it a bit!
In addition to some wording and code tweaks, engine textures and materials are no longer updated. Also, duplicate and empty texture GUIDs are now handled together.
This should hopefully simplify the process, and make it clearer when changes have been made!
Github can be found here, and a compiled version you can drop into your BluePrint-only projects can be found here.