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Personally, since the Access-Aide plugin already has the functionality and I do try to have my ePubs accessible so I would continue using it, I'm not sure I use make use of a plugin to handle that subset functionality.
What I've been doing is to use two search and replaces based on the preceding terminator (was it a </h3> or a </p>) to set the alt text between scene break image and chapter header image for those books where the same image is used for both. A bit of a kludge but works for me.
Where the chapter header itself is an image is a bit more fun but I've already described my workflow.
At some times, I have to ask myself, just how many saved searches can one person need...
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