ID check is free though... It won't cost you anything and then if you pass you just go around and register it at the ServiceSA place around the corner.. Rego is only $40 for a day too. Virtually nothing to lose and $1000 to gain.

Fair call on the doing it right bit but you're paying for the engineering certificate not the fix. I had a similar crack welded up once and it cost $100.

Not trying to convince you, just saying there is other options. I'd get it welded but not bother with the cert.