I've written on this publicly. I'm not a big fan of the proliferation of independent officers of Parliament, in part because I think reporting to the executive actually gets us more timely, more efficient and, in many cases, more effective action. I have a lot of faith in whatever executive is in power to take action.
An independent officer of Parliament will help with transparency. I do not believe that an independent officer of Parliament will help get things done or will help to get it done faster, better or more efficiently.
I think the bureaucrats are very well intentioned...or an independent outside judge or some combination thereof, as Australia has done in the past with people who understand the system. I'm not sure you'll get something better out of an independent officer of Parliament, but I'm married so I know I'm wrong all the time.