Driving in a manner dangerous carries a MANDATORY minimum disqualification period of 6 months. Doesn't matter who your lawyer is, what paperwork/excuse you give, or how nice the magistrate wants to be - if you are found guilty of that offence you will be walking for 6 months at least.
Actually, I've just checked, and you're lucky it was before 1st December, as the minimum is now 12 months see this link:
http://www.lawhandbook.sa.gov.au/index_article.asp?id=5088