After having read tons and tons of books and info about doping in cycling, I am absolutely sure that, if planned, getting a BB into Australia entails very low to no risks at all.
I'm not saying the players would smuggle the BB in their personal suitcase, of course. But bear in mind blood isn't exactly what airport security is looking for.
Wouldn't it show up as a liquid? And isn't that forbidden to take on a plane?