Has anyone been able to "switch" their medical insurance from one country to another?

I'm looking for insururers I can contact to obtain medical insurance without having to go on wait lists because I have had insurance in Australia for over 4 years (with a local company - won't make that mistake again).

Specifically, I want someone to provide hospital cover for the birth of my second child in January! Don't really want to fly home.

Also, BUPA said they would not switch so please don't suggest them.

Many thanks