Hi Fred, thanks for your kind word. Happy holidays!
Having just returned to the lab, I am doing a bit of catch up, so this is a short answer and I don’t really have time to test things.
I think the endnote position problem might be addressed here: https://uknowit.uwgb.edu/page.php?id=36665&no_frill=1 but I don’t use them, so I am not exactly sure how to do this, if you already have multiple sections.
Once you have the endnotes at the end (of the section), insert a section break before the EndNote Bibliography so it lives in a new last section. Make sure you are showing paragraph symbols and grab the entire field when you move it. It should stay put after that. I may have time to test later in the week.
And yes, if you want to finess the notes and bibliography you will need to remove the endnote field codes on a copy. The best way is to use the endnote tool (on a copy of the book document as you know) convert to plain text, so it doesn’t remove other Word field codes relating to contents, indices or the like.