I'm so glad you discovered that trick. I've just concluded a week in The Parlor of The Magic Castle, doing all mentalism (if one can call what I do that) and featuring "Journey to Love" in the middle of my set. I don't think I've ever had more fun on stage. I get to pick out the prettiest girl in the room and slow dance with her to The Carpenters' "Close to You". When I was in Jr. High, I'd worry about asking a girl to dance. Will she like me? Will she hate me? Now, I get to walk out, face the audience, look over the crowd and say to myself "In a few minutes I'll be dancing with...HER." Does life get any better?
Also, since I do "The Very Last Card" as my closer, I didn't want to use playing cards in this effect as well, so I used children's flash cards for the needed representation of numbers. Lots of comedy opportunities.
I have become a pig-headed little man, and I have to say I love the construction of this effect. My small contribution to Don Wayne and Larry Becker's work has resulted in a routine that is one that tickles me every time I launch into it. I hope you get a chance to use it.