Yeah doing a group send for BGS from Australia is a bit difficult, since you would have to have someone sort out all the forms to avoid paying the fees(as the cards will definitely total $1k, and that will require import fees).
I did do one with Garth (postgsl) a year or two ago, and that was really smooth as he had to take quite a decent amount of time to fill in the import forms
Ive also sent in one myself and that was probably the quickest, only problem is that I had to undervalue my cards a bit to avoid the $1000 import limit
But on Blowout there is a very respected member whos been running these for a while, so I might send in a few and see how it turns out