There is a third australian that fits the 'triangle' but I have to find the connection between Hogan and Farnham before I can figure out who the third person is...
Glenn Wheatley, John Farnhams manager & John Farnham are apparently in an Aussie phone advert where a sheila sees them in a shop and she phones her mate to say that she is in a shop with John Farnham & Paul Hogan (mistaken identity obviously), so answer cud be Glenn Wheatley (Ive never heard of him)