- It may be that the document is a PDF, not a Word file.
- It may be the case that the PDF that someone has access to is not text-copyable.
- So, it might be the case that as a first step a person with access to the document might need to first get it on an unsecured computer, transfer it to a thumbdrive, take the thumbdrive to another private computer with OCR software, and do OCR on the copy of the PDF to get ASCII.
But then I think the rest of your suggestions might work; though I should stress that the world is full of people who know more about this than I do.
Techdirt has not posted any stories submitted by RobertNaiman.