Change URL on product listing

Hi everyone, 

I would like to know whether it's possible to change the URL of one of my product listings, presumably by targeting the block ID. I want to make one of my product images (on the main shop page) an 'advert' placeholder to promote free shipping by uploading an image where the product would usually be, but would like to either disable or just change this image linking to its product page.

As an example, you can see this shop has their shipping details as a replacement for a product on the grid.

Many thanks.

This should be possible in the same way - by adding the Delivery information as the product image for a dummy product. This product placeholder can then be modified to remove the metadata and redirect to a delivery information page.