Not a problem
Been there, done it, not had a problem going back several times since. Aside from the Drink driving charge which I don't know if it has any affect, the rest doesn't. You might hit problems if you wanted to buy and register an Aussie car there because that might show up on the RTA database. However even then, unless you are on an Aussie license and still trying to use it then they probably won't connect the two. Its not going to connect through to having a criminal record because they wouldn't be able to serve notice for criminal proceedings etc. Its likely to have expired, archived off, etc and unless you are going to try and find and resurect the Kingswood then they are unlikely to connect the whole thing anyway.
Of course, if they take you round the back of Sydney airport and give you a good kicking before chucking you on the first plane back out then I'm just been quite luckly and complete misjudged the situation.
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