We're in a similar position. Here in Thailand you can't demo rackets either. And it's also very difficult to find certain rackets, such as the Pacific Vac90, which is not imported into the country at all. I got mine from TW.
And I'll check with my customer if he'd be willing to carry two rackets back to Melbourne for you - the 4D100 and Bio100 (just for kicks
) in return for your kindness with the iPrestiges. If it's not possible for him to carry, I'll find some ways to send 'em over.