Great question! I'm going to add this as a note in the back of the book, but: What I've been doing for shorter APs is instead of using a full deck, pulling the top 10 cards off and using that as my "deck." The only thing to make sure of when you do this is, if there are any kings in the mini-deck you've pulled, that you add in the Ace of the corresponding suit. Then, just shuffle in the Joker into the back half of your mini-deck as usual.