When I first saw the name of this, I thought that you were talking about a new America-specific jurisdiction of the Eastern Orthodox Church! I really like that you are attempting to speak on practical ecclesiology and wondering about how to reorganize society around an accountable and streamlined church institution.
I wonder, how would you compare your ideas to that of existing historical ecclesiological models? Christians have obviously been thinking about these questions for a long time. I think the main thing that catches my eye here and admittedly sours me on your ideas is the idea of little or no confessional standards for participation. How does this not become Universal Life Church or the Freemasons? Around what is this organizing? What even makes this a church?
I also am skeptical of your aim to put ritual, "mutual aid", "moral formation", and "character underwriting" above metaphysics. This seems to undermine itself immediately, since to proclaim what is aid or morality or virtue is to proclaim metaphysics, and so this seems to unknowingly or deliberately smuggle in presumed metaphysics that sees itself as self-evident. At least to me, metaphysics is so much more important than pretty much any other civilizational issue that to treat it as something to brush aside to search for common ground elsewhere points to your project having an ultimate reference that either unfortunately downplays the centrality of the one true triune God or dilutes the language of church tradition through using the language of church (appealing to Christian sensibilities) toward short-term temporal aims.
Paul said that if Christ did not rise from the grave on the third day, our faith is in vain. I say that we take this seriously. For me, your full project as presented would not make a good investment compared to something like a detailed ecclesiological study of existing church institutions. I would be interested in seeing you address some of the concerns mentioned above and also tune up the mission of this project, tying it explicitly to its metaphysical and traditional dependencies.
I have a good example off the top of my mind of a study of the practical implications of theology on ecclesiological models and subsequently the political climate of a nation:
Compass Rose: Calvinism as a Theory of Recovered High-Trust Agency