This site converts a middle-click on a Discord image embed to a redirect to any URL you want. You can try it out here.
Apache checks the UserAgent. If it's Discord, it redirects to the image. If not, it redirects to the URL specified in the redirect query parameter.
This was created simply out of curiosity. I wanted to see if it was possible to do this, and it turns out it is. I'll keep it online as long as it's appropriately used.