Ahem. The USA has been on common law all along. And we threw out the Admiralty in the 1770’s. Those words mean things other than what you think they mean.
I’m seriously worried for you here. When you use language like this, you sound dangerously close to falling for pseudolaw scams, which could cost you a lot of money and/or your freedom.
This stuff does not work. The law does not work that way. Common law is not some magical consensual opt-in. We are not living in the Biblical Book of Judges, where every man can do as he sees fit. Our society and legal tradition is both largely democratic and largely common law already, and there’s not really a contradiction there.