I respect your opinion, you understand what is going on, but I disagree you should allow DC current to flow. What is kind of strange you then gave some RF Issues that can be caused from it. RFI sounds like an effect to me. But here is my point. All grounds should not be carrying any normal operating currents because that defeats their primary purpose of providing 0-volt touch potential. Current flowing on a conductor will develop a voltage drop along its length. This is why electrical codes forbid normal operating currents flowing on ground circuits. Secondly DC current is destructive to your ground electrode system if you bond the negative polarity. That DC current flowing will greatly accelerate corrosion on your ground electrode system. This is the exact reason why telephone companies, cellular, data, you name it bond the Positive polarity to protect the ground electrode system and greatly slows down corrosion. Respectively I find that funny. I use a lot of ironic humor, and this is great material. Example I often say: Hams love having messed up grounding and bonding because it gives them something to fix and spend more money and time on. Ironic huh? Why give yourself the problem to start with? It is a simple 10- minute zero cost fix.