Have you tried Citi? They do all kinds of multi-currency accounts, have seamless overnight inter-country transfer etc. and are reasonably flexible. Only downsid

Have you tried Citi? They do all kinds of multi-currency accounts, have seamless overnight inter-country transfer etc. and are reasonably flexible. Only downsides are that they'll include your Australian Citibank accounts when reporting to the IRS, and they're monolithic.