Hi there serendipity,
Welcome to the forum.
I would definitely seek the advice of a migration agent with regard to the skills assessment and the ASCO definition you would be choosing to apply under. If your husband's job description is on the SOL (
1220.0 - Australian Standard Classification of Occupations (ASCO) Second Edition, 1997) and he's been doing that job for over a year, I can't see what the problem would be. Why would you think he wouldn't pass a skills assessment?
There are 2 agents who occasionally post on here, Alan Collet and Liana Allen. Also, I'd recommend contacting George Lombard. The first consultation is usually free, without obligation.
Let us know how you get on.
Dolly