As cringe-worthy as it is, Kath & Kim has become engrained in our national culture because there are so many truths in it. Don't tell me you haven't watched it and seen a bit of your mum/sister/daggy uncle/neighbour or heaven forbid, yourself, reflected in it. How then, will it sit with the Yankees? Obviously they wouldn't understand the original, considering a fifth of them can't even locate their own country on a map (thanks, Boston Legal), or name a country beginning with U (thanks, Chaser), so the chances of them "getting" the Aus version are pretty slim. As slim, say, as Selma Blair ,who plays the "chubby" American Kim:
The writers of the US Office needed to rework the show so the jokes were obvious. Perhaps they considered some hilarious pie throwing incidents. It's so far from the UK Office that you have to wonder why they bothered anyway. And can you imagine an American Sharon? Nope. And thus it is clear: if Americans can't appreciate the humour of the original, then why develop another?