I would have thought that to remove the "Freeview" from the TV, a firmware upgrade to a manufacturers standard version would be required. Either that, or hack the firmware. I'm sure a TV or set top box from Australia would most likely get around that problem, set it to 8 MHz channels and away you go.
PITA if you have to go to those lengths though.
I'm curious to know how many muxes are on the air in each centre, and what channels they are using, although I believe the channelling is done in two different rasters of odd channels and even channels from a given site.