That won't work. Ein also has a mid kick launcher that uses the 33K input. What I usually do is do the 632 motion before inputting the K.You can input 33 () for the WRK. It's what I do with Leon. You just have to make sure you pre-buffer 33 before the animation of your previous attack finishes. If you wait a bit too late you'll just get Ein's 3K etc.
EDIT: Example gif: