Custom plugin to bulk delete images from Woocommerce

I want a custom plugin that will pull out all images associated with out-of-stock woocommerce products and delete them. I have a Woocommerce shop selling secondhand roleplaying games ([login to view URL]). One of our USPs is that we show images of the actual copies we have in stock, not some generic image taken off the web. To save on hosting storage space, I'd like to be able to _easily_ bulk delete images associated with out-of-stock products (including all sizes of image, like thumbnails). At the moment in woocommerce, there doesn't seem to be a way to do this without deleting the images for each product one at a time. That would be a very lengthy job - at present we have 500 out-of-stock products. However, I don't want to delete the other data (like price and description) associated with an out-of-stock product because I don't want to have to retype a product description when we get that item back in stock.