Dodo 56, I absolutely agree. I flew these aeroplanes between March, 1980 (HLA's first commercial flight to Tripoli, with Captain Peter Jobling,) through to September, 2002 on the last UK commercial flight into Southend.
I don't know if there are museums in Oz but I doubt you'd ever get anyone to pay to bring her home.
The only other Belfast I know of is the one at Cosford:
Short Brothers Belfast CI airplane pictures & aircraft photos - RAF Museums