I'm not sure that it would. Any outside scrutiny or intervention by an officer of Parliament would be helpful, but that's speaking generally.
Frankly, if someone is unrepresented in dealing with these situations—and again, I'm speaking as an advocate—the situation would be very different, but ultimately, in most cases I've found myself involved with, I've been able to work things out with the department officials. I have 30 years of experience as a lawyer, however, so it's easier for me to try to convince somebody than it is perhaps for someone who is unrepresented, for sure.
Your idea may be a good one. Having an option for somebody who isn't represented to have assistance, for example by going to a commissioner, may be helpful.