No you cannot contract with yourself, but a company is a separate legal person so the wife and the company can enter a contract.
Get legal advice on the asset protection aspects.
See subsection 4 of s32J
http://www5.austlii.edu.au/au/legis/vic/consol_act/da200093/s32j.html
And s32K
http://www5.austlii.edu.au/au/legis/vic/consol_act/da200093/s32k.html