Sara,
Thanks very much. Worked great. A couple of comments for others interested in doing the same:
1. The 'result' file prints with comments -- either on the same page or a separate page. I chose separate page and then 'printed' to a separate pdf only odd pages -- thereby eliminating the comment pages.
2. I doubt many people are going to be working with a 1600 page document. I ran 3 or 4 test runs with different options so it took a while. If I need to do it in the future, I'll take a sample page set (and sample search words) and run through different iterations to determine what I want as a final product -- then run the process on the full file.
This is not something that I will need often. If I did, I would spend more time tweaking it. As Sara noted, there's a bit of variation between IX (that the referenced article is about) and X Pro which I use. All-in-all, a clever work-around.
Thanks again!