I think that's where your thinking is flawed. You are looking for a silver bullet, but you wont find it. Too many issues at play here. I believe fish farms have a much bigger impact to wild stocks than what people, such as you believe. I spend a lot of time reading on this subject.
However, I strongly believe that there are other factors at play such as habitat loss, water quality from encroaching human pops, overfishing etc. An easy start to helping our wild fish is removing these farms. They only employ 600 people, a drop in the bucket. If our fish return those 600 jobs would easily be absorbed into the growth of the rec sector which currently employs over 10,000 people.
Each problem presents its own set of challenges. We don't benefit much from the farms. We remove protein from the ocean to grow protein at a loss, doesn't make any sense. Not to mention all the problems we have with the farms from disease and mass culls, to sea lice issues, escapes, BC tax payer payouts, wild forage fish for feed and there is more.....all for a measly few hundred jobs? Not worth the risk in my opinion.
anyways, rant over I'm out.....