My response was essentially, "I can do it, but we will need to explain why we are going against CDC guidelines or else I see a mass problem on our hands. Can you get that reasoning for me so I can share it?"
A few hours later, the request for the memo was rescinded. Big win in my book.
Or better yet, finagle it so they ask you in writing for a scan of your card, then take that evidence to an attorney so it doesn't become a "well, it was a suggestion, not a demand" type situation.