I don’t know if this helps, but I posted Jongware’s last version of his script here: creativepro.com/files/jongware/binaries/multipagepaste.zip

See this thread: https://creativepro.com/topic/synchronising-footnote-options/

No, GREP is for finding text patterns. It doesn’t have anything to do with images or scripting.
You can already export each page as a JPG using File > Export. Often it’s easier to export all the jpegs and then batch rename them after they’re exported. For example, on the Mac you can use the Rename feature:
https://tidbits.com/2018/06/28/macos-hidden-treasures-batch-rename-items-in-the-finder/

Otherwise, there are some scripts out there that might help, but I haven’t tried them for a long time:

Script to Automate Image Export Renaming

or

Export pages to jpg with custom filenames

This is different but might also help at some point:

Remove Multiple Returns and Replace with Space Between Paragraphs

So you don’t want to be alerted when tracking is +14 but you do at +16, right? That could be done with scripting, of course, but I don’t know of any good way to do it with the built-in tools.