A Hanafuda deck is not always available when you want to play koi Koi. Fear not ,because any 52 card western deck can be used to play Hanafuda games. Since there are fours cards of each rank it is simple to let the ranks of the card be it’s Hanafuda suit. So you would remove the twos from the deck and you have 12 Hanafuda suits. For example all the aces would be Pine/ January. The ace of spades would be the bright of the suit, the ace of clubs the ribbon, and aces of Hearts and Diamonds would be the trash cards of the suit.
If you do not mind drawing on your cards, the special cards of a suit could be marked with a sharpie marker. Otherwise you could simply write a the role of each card on a piece of paper. Maybe even write a list of the Yaku with the modified suits on it.
If you have any ideas how to improve this idea please share in the comments.