It sounds as if your client is savvy enough with an image editing program.
Just thinking out loud here, but you could add a custom meta box and have the client upload 2 images. 1 – The smaller image that puts the focus where they want it 2 – The large image, to be used as the “Featured Image”.
Then call the custom image in the theme and the large image on click. I know it is an extra step for the client, but this is a method I have used in the past for a similar situation.
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