The two ocean navy concept was pushed by ex PM Malcom Fraser when he was defence minister 69-71. This two ocean navy was meant to have three CTOL carriers and 23 destroyers and frigates.
I first became aware of this via a conversation I had with a FAA member in the mid 80s and assumed it referred to multiple STOVL carriers, I later discovered via old periodicals in the uni library, that it referred to announcements and statements made by Fraser when Def min.
There have been stories over the years of ex RN carriers, Hermes for instance in her CTOL config but also Eagle. Victorious also (possibly) just fits this time frame as she wasn't listed for disposal until 1969.