A deformation question


I am trying to find a solution to an animation challenge I am having with deformation. Is it possible, using one or several of the deformation tools in Harmony, to get a round or rotund shaped character look like he is going through a hourglass, top to bottom. The character starts full shape at the top, and then he deforms to go through the thin opening of the hourglass in the middle and ends up full shape at the bottom.

I am trying to figure out a way of doing this with a fully rigged character, not just a drawing.

Any ideas?

Thanks in advance.