I would just stick with some junk silver dimes. A better solution for small silver in the event of a zombie apocalypse with a much lower premium and there are tubes for those
Did you say Unicorn? Picked up a few of these from the mint. The Unicorn of Scotland 2017 UK Silver Proof One Ounce Coin
I would think it is easier to explain what pre-65 silver coinage than to explain what a tic tac made of metal is.