Thanks so much for your prompt response and advice!
Yes, understand that typically CFAR refunds are in the form of credits. However, Holland America's CFAR is in the form of cash, at either 80 or 90%. The reason for CFAR is more for the issue of pre-existing conditions, as one cruiser has some chronic issues. So, while we would anticipate canceling only for a "covered reason," it may be tricky if there is a history of pre-existing issues and proving that event is due to something otherwise.
I did locate a third party provider who said that I could use its policy as a gap policy. That is, if the canceling reason was a covered reason, but the cruise line only covered 80% of costs, I could list the remaining 20% (actual cost), so that they would cover, and additionally, have the included medical/evacuation benefits on that policy.
Does that approach sound reasonable?