If it happens to have the "Complete OST" information, it's because that's how I organized it (I'm sure I got the labels wrong too); I'm still waiting on my copy of the Complete OST.
Unless I'm missing something, it sure doesn't look very hard. I do appreciate that you need to make better use of your deck though. In the original CoM, just get 9 and 0 cards and go to town; doesn't really matter if they're kingdom keys or whatnot.
Fun? Yes. Hard? Not yet... I have high hopes for this ^^