Forgive the slip of the pen (keyboard) when it comes to Reform Judaism! It was quite unintentional. I know better.
We seem to have stumbled onto potentially common ground with regard to the Holy Spirit or Spirit of God, at least in terms of how the Spirit interfaces with personal and corporate religion. I'll look forward to seeing how this affects our unfolding discussion.
Language appears to be one of your underlying concerns. Certainly the use of terms such as "king" and the others you mention may foster inappropriate understandings of God. I sometimes long for updated language myself.
Yet...and there is almost always a "yet"...the language may serve a purpose the authors could not have envisoned. Having to deal with the language may force us to think seriously about modern assumptions. What's good and not so good about modern forms of democracy, individualism and the like? Perhaps one could even say, if God is Lord or King no one else has the right to claim ultimate authority over the world, others or me. This kind of thinking may foster passive resistance to dictators, consumerism, or other would-be lords.
Do you have anything else you want to say about the Third Commandment? If not, let's consider the Fourth Commandment.