It can be done in postwork, however you would need to spend a disproportionate amount of time cloning, masking and generally playing around - especially if you dont want people to realise it has been postworked so severely.  The best postwork is the one where no-one realises it happened...

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography