So do I need to speak to an Australian lawyer about how to proceed? I don't want to spend the little remaining funds on legal expenses, but also don't want to do the wrong thing and end up in legal trouble as a result.
I'd just contact ITSA for advice. There's a toll-free number residents of some countries can use or you could email them if you want stuff in writing.
http://www.itsa.gov.au/dir228/itsaweb.nsf/docindex/contacts-%3Econtact%20usI'm not convinced that the other directors of HNWP aren't just as liable as Andre, but that's only an issue if people are lodging lawsuits.