Originally Posted by VDM
Smudging or liquifying would blur all the details
Hmmmm...while I couldn't care less about who's right/wrong, I added Liquify to the mix in the first place because it's possible with Liquify, (in my experience), to get the exact effect in the OP image without obscuring detail. Just have to keep the brush size small. If the effect of Photoshop's Wave filter could be this randomized, I may have to play with it some more.
IIRC, Corel Photopaint had/has a tool that would do this nicely too, although its name escapes me.