One of the things you could do is calculate towards understandable numbers. Per tax payer in Britain (32 million) it would cost ~1150 for that first item on the list. Imagine the amount of dinghies you can buy per person for the lot of these. Billion just isn’t that magnitude to most people.
Full face tattoo and getting multiple people on board might do the trick for however long until additional markers are found for the edge case. I think clown makeup would do better since it varies day to day.