It should be pretty simple to achieve.
1) place a temp image into your image folder.
2) during formatting of the output, check the url scheme $_SERVER['REQUEST_SCHEME'] if its http, replace it with the image as a link to the original url.
I do it a bit differently. I do not allow external images to be displayed anywhere in my code. The term is 'image proxy' and the idea is that you can either download the image to your site and replace the external url with the internal one, or you can use an image proxy host, much like an anonymizer. The image proxy host will grab the image and send it to you, https.
The benefit of doing it internally is that you can manipulate, resize and optimize the image to display as needed. It also allows the users browser to cache the image.
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