Hi. I don’t have a direct answer, but I do something vaguely similar, just without paper.
Do you have an Android tablet by any chance? That’s what I take to the pub, for planning mountain hikes with this group of friends, or caching runs with that group. It runs Locus Map (free or pro), which is both a superb map app (OSM of course), and a very functional caching app.
With that app, solved caches - assuming you’ve entered the solved coords on the website - show in the correct locations on the display after downloading a pocket query. No one else except your friends across the table have to know.
I also love having the same app on the tablet, for large-screen planning, and also on the phone, for navigating and caching in the field. Only have to learn one app this way.