Brute Force aspect ratio

Unfortunately the exr image sequence contains an aspect ratio that is not desired. Therefore after loading each shot into RV, we have to go into to Image/ aspect ratio and then toggle the one we need. So basically not taken from image.
Is there a package we can load that for this one job loads up and every shot is forced into that requested aspect ration rather then manually navigating to it each time.
Maybe even combined with a matte and opacity setting?
Thanks for any suggestions or ideas or help you may have.