I hate to belabour this, but I'm still confused. Your report says, “This addition to the duties of the Ethics Commissioner”; I presume you mean by “this addition” the addition that members of the public, through their parliamentarians, could bring issues to your attention. Am I right in that? These additional duties of the Ethics Commissioner provide a way for individual members of the public to request investigations.
You sought a legal opinion, and the legal opinion said that it would be ultra vires. You say the legal opinion, in your view, still stands as the advice given to you by whomever you hired for that purpose.