If you don't fancy the silicone arm, why not go for a full festive body suit? This thing is as sensible and realistic as any anti-vaxxer "data" source, so there shouldn't be any objection to it at all. And, given we're in mid-December, it's perfectly on-trend. And it's sure to be a big hit with the laydeez, too. Just buy one and turn up at the vaccination centre wearing it, then let us know how you got on.