Give the number of additional images I have, it's not a huge issue if this going to prove too onerous. I can edit/prepare the images in advance - just wanted to avoid doing so.
You could use a site-specific init_includes module (you'll need to add an auto_loader, too) that loads somewhere around CP 200 that makes the change to $ihConf (it's a global variable) as you'd identified a couple of posts back.
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