I like this Jokers Wild trick very much,easy to perform and great reactions (for my exp.).
I also added a alternate finish to stay clean at the end of the trick.
My way to stay clean at the end is to slip cut the choosen cards out of the "middle" of the deck ...i try to riffle down approx. the same amount of cards where i had "put" em into (usual 1/3 and then the middle of the deck).
So the illusion is given that it was alltime the joker
Try it !
greetz
Jerry