HighFlyer75,
Increasingly, there are FAA A&Ps and AIs around Australia, with the way CASA requirements for maintenance are going, having N (or other) registered aircraft in Australia will become increasingly popular.
The maintenance requirements of FAA Part 91/43 make far more sense than Australian (particularly the new) regulations.
If you are operating on an AOC, the aircraft does not have to be VH-
Already a quite significant proportion of the executive jets owned by Australian companies are on the likes of the Bermuda or Isle of Mann register.
Tootle pip!!