If you had researched this a lot - or even read a few paragraphs of the websites linked, you would have the answer to most of your questions. What no-one here can answer is how his individual case will be viewed, and you cannot "find a way around" these rules.
Just some samples from the site I linked:
If you have criminal convictions, with a prison sentence totalling 12 months or more (whether served or suspended), you will fail the character requirements and you cannot apply for an ETA visa for Australia. It does not mean that you cannot get a visa, but you will have to supply further information to enable authorities to verify your character.
Additional requirements when applying for you visa:
Being able to support yourself financially during your stay in Australia
There are also additional costs.
- You will have to pay an Australian Government application fee for processing the application.
- If the application goes for further character assessment, you will have to pay a further fee
- Additional fees that may apply are for a police clearance certificate.
- There will be additional fees (payable directly to the agencies involved) if any documentation requires verification
If you are travelling in December, you may have left it too late.
When criminal convictions are involved it typically takes at least 3 months, but it could be up to 12 months, to obtain a decision on a visa dependent on the severity of the sentence and the exact pathway that is deemed suitable for the application by the Australian immigration case officer assigned to your application.