... This may sound like a dumb question, but are there any national OC organizations? Meaning where accepted guidelines for stuff like this are spelled out for instance?
I mean it seems to me that if there were an agreed upon set of productive guidelines, complete with measures for confrontation with the police, a lot more could be accomplished than by these autonomous groups. Even at the state level.
If there already is, are these small neighborhood groups just refusing to ally themselves? All honest, albeit maybe ignorant questions.
I think OCDO (OpenCarryDotOrg) is the closest you'll find to a national "organization". But no, I don't think you'll find "rules" per se, except those that may be suggested by organizers of individual OC events.
Open Carry Texas is probably the biggest and most well organized OC organization, and I believe there is/used to be MCDO (or something like that) - Michigan Carry. You could look around here for more info on them, or one of the denizens (I mean residents) of OCDO could fill you in on them.
Fascistbook has an OCDO page, an OCT page, and a VCDL (VA Citizens Defense League) which you may wish to investigate.
Again, my best suggestion to you is this: if you can't find a group or organization that fits your idea of what OC should be about, in its many positive aspects, organize something yourself - an OC education or introduction walk, an OC picnic, an OC whatever. See if you can contact some of the people in the YouTube videos with whom you might have common ground and engage them in conversation. (Rumble is a YT alternative, I'm told)
As much as I despise the censorship, etc. of social media, it really is a great medium to communicate with broad swathes of people.
HOWEVER, there is no better website than OCDO to find well organized and deep discussion like this thread. The ONLY thing that comes close, in *some* respects, is the Open Carry Texas page on Fascistbook: life expectancy unknown for obvious reasons.