I envy you. With that much imagination, you will never be without images of Kari!
But your imagination shouldn't have to work that hard. There are several models & actresses out there who (at certain angles, bodyweights, or pre-boobjob) look a bit more like Kari, and do naughty things. A few selective frames pulled from this Julia Bond (who usually looks nothing like KS) porno might give your imagination a rest and your hand some exercise:
(To make the above illusion work at all, you have to look at it one-handed from an erect position and really want it -- c'mon, we all know Kari's unique!)