Out of urgent need, I ended up forking this module: https://drupal.org/project/commerce_empty_cart_paths - to basically do the opposite of what it is intended to do. i.e. set a path to empty the cart, instead of setting all paths in which the cart does not empty. Kind of on a deadline, so sorry for the hack! ...but, eh, sometimes you just have to get the job done.

When I have a bit more time, I will go back and patch this module, but being that I could not find a solution for this anywhere, I figured I would post it here to help some lost soul between then and now. Again, sorry for the fork. :)

This is what I did:

1. Edit this function: commerce_empty_cart_paths_page_alter(&$page) - and switched it so that instead of looking for all paths on which to not empty the shopping cart, I told it to look for just 1 path on which to empty the shopping cart.
2. Within that if conditional, after empty the cart, I added a simple drupal_goto() redirect back to the users' dashboard
3. I created a blank page with my desired path (e.g. cart/empty or products/empty, etc).
4. I added an additional global text area to the bottom of the: Commerce - Shopping Cart Block with a link to the empty cart path
5. I styled the block accordingly

As I said, time allowing I will go back and patch this module to allow for either: all empty non-empty cart paths (by default) or a single empty cart path.

Good luck.