I need to delete a portion of my stock photo collection

It turns out that if you upload an image which is ProPhoto RGB, Adobe will strip out the colour profile and anyone purchasing an image will receive an sRGB image without the colour profile, so they can't ever see the intended colours or retrieve them.

About a quarter of my catalogue is ProPhoto RGB and I need to replace the images. The problem is that there is no simple way to bulk delete images, so I'm calling out to Adobe to help me delete a portion of my collection and replace it with sRGB images.