I tried the various suggestions out this morning and have something that is not perfect, but it is a start.
The
suggestion that Sato-san found was the only one that seemed to do the
trick. It's a few extra steps, but it seems to work. Simplified, the
steps are:
1. Set Word to show field codes (Alt-F9).
2. Search replace using wildcards to remove the content of the ruby fields.
3. Hide field codes (Alt-F9 once more).
4. Copy the text and paste without formatting to remove the (now empty) ruby fields.
The
last step is a bit of a hassle, but it seems to be better than using the "clear readings" option, which is what someone else suggested. That's what I was doing
before, but the "clear readings" option only clears the ruby text from
about two lines at a time. While this is the cleanest approach, I
anticipate seeing at least a hundred pages in this job, so I was trying
to avoid this method.
Again, thanks to everyone for their suggestions. If I come up with anything better, I'll update this thread.