Sweet! I like it exactly like you did it and wouldn't change anything you did. But since you are sitting at a table, you could take advantage of that fact and vanish the Sharpie (by l a _ _ ing it). That way, you add a very magical kicker, and if you do it in person, it also eliminates any concerns about examinability. If you don't have a good method for the vanish, send me a private message.