Yes, I too have furthered the question with some Australian gunsmiths, including some from our fine defence force ( the boys that service and maintain our Tac 2's.)
Mention Blaser barrel steel, and the proposed works, and they run a mile.
However, there is a solution of kinds.
If your prepared to deal with the Australian importer, ( many are not ) and pay the $800 surcharge, then wait six months for a reply from Blaser, before they accept your order.
Blaser will build just about anything you want, it's really just a dollars game.
Thomas Haugland has a huge following in this country, and is an alround good bloke.
Hitting the fly three times in one detail at my rifle club, is referred to as a Hauland. LOL, but its usually only the Blasers that can do it in hunter class.