Rename listing image filenames

Hi

I’m wondering if you have any advice on renaming the image names associated with my listings on the server?

I’ve uploaded all my listings via the CSV Import and uploaded the images via FTP and they are all working correctly.

What I would now like to do is rename the image filenames incrementally based on the listing title e.g.:

listing-name-1.jpg, listing-name-2.jpg, listing-name-3.jpg

Now there’s a few WordPress plugins out there that allow you to do this, but these seem to assume the images are part of the media library and because of the way GeoDirectory handles the images this isn’t the case.

I’m trying to do this for improved SEO and also so it isn’t obvious to competitors where I got all the images from ;-).

So what’s the best way to go about this? And preferably how I can do it in bulk automatically?

Thanks