I don't believe there will be enough natural forage in a pond that small to support the number of BG that you would like to harvest.
I think pellet-feeding your BG would be the biggest improvement to your productivity. You do not need an expensive automatic feeder. Once you are living there, you can hand toss the pellets to your fish.
Channel catfish are more efficient in turning feed into meat. If you are really going hard-core on the "off grid" lifestyle, they might be an alternative choice - but not quite as tasty.
Good luck on your project!
