Script to remove image orientation
Can't offer an Automator script but Jhead which is a command line Jpeg header manipulation tool.


Download jhead
Start Terminal.app and move the file to /usr/local/bin/ with  

sudo mv ~/Downloads/jhead /usr/local/bin/jhead


and enter your password
Make it executable sudo chmod +x /usr/local/bin/jhead
Entering jhead -v -norot ~/Pictures/folder/subfolder/*.jpg should do the job and clears the Exif header rotation tag without altering the image.


Here is the manual. Make a test with some pictures in a subfolder before you rot your original pictures.