Clean up various OEPBS references?

[Evil Overlord]

How can I clean up references to virtual OEBPS folders?

I used Calibre's EPUB merge feature to merge 9 EPUBs of a series for my own convenience.

(Because there were some overlapping file names?) Calibre created 9 virtual sub-folders. While I had the omnibus, I took the chance to harmonize style definitions, images, etc. across books in the omnibus.

There are a couple of recurring images (for scene breaks) across all volumes. I necessarily chose one iteration of the image for harmonization. For example: src="../../../9/OEBPS/Images/MyImage.png"

I'd like to get rid of the virtual folder, and just refer to, e.g., src="../../Images/MyImage.png"

I'm not sure how to go about that. Could I just use Regex to remove/simplify all the references in content.opf (e.g., to convert "1/OEBPS/Text" to "Text") and then recreate nav.html, or do I need to look elsewhere as well?

* I grant that this probably wasn't the best way to harmonize things. That effort grew out of the omnibus rather than being a primary purpose of the merger.

** I also grant that the virtual folders probably don't make much difference. But it will make me feel better if things are neat and tidy.