Merry Christmas to you too!
That's all right. Actually, you don't have to incorporate your character right now as part of the crack isn't just inserting your characters/yourself. What you can do is try to have Zero and Scrooge go through the dance and the part where Scrooge and his sweetheart breaks up. :P However, Feign is reserving the spot, so wait and see what he has. If you can't wait, maybe try to go for Christmas Present where Scrooge sees what is going on outside and also in the Cratchit's(?) house (Tiny Tim FTW! :P )
I do like a couple of your riddles, though. :P