Let’s leave aside the incorporation issue. You mention the natural right of revolution (with which I agree), and you tangentially touch on the natural right of self defense that was well accepted by the FFs (again agree).
You say the purpose of the 2nd Amendment was to prevent the federal government from disarming the states and citizenry through a standing army loyal to the federal government (ala James 1, Cromwell, and many others the FFs would have been familiar with). This would protect the natural right of revolution against the federal government by assuring that states are armed and that these armed men would not be under federal control, but would be led by state appointed officers and state led training. Again agreed.
Now it seems that you follow the above with a view that that this guarantee was best carried out only by an enlisted/conscripted state militia (“it makes more sense that the 2A applies to the state militia as opposed to the individual”) as a subsidiary of the state’s population rather than the body of the state’s people as a whole? how do you square that with the FF’s views that the true strength of the Republic lay in the fact that each free man be armed? Madison in Federalist 46 writes:
“Let a regular army, fully equal to the resources of the country, be formed; and let it be entirely at the devotion of the federal government; still it would not be going too far to say, that the State governments, with the people on their side, would be able to repel the danger. The highest number to which, according to the best computation, a standing army can be carried in any country, does not exceed one hundredth part of the whole number of souls; or one twenty-fifth part of the number able to bear arms. This proportion would not yield, in the United States, an army of more than twenty-five or thirty thousand men. To these would be opposed a militia amounting to near half a million of citizens with arms in their hands, officered by men chosen from among themselves, fighting for their common liberties, and united and conducted by governments possessing their affections and confidence. It may well be doubted, whether a militia thus circumstanced could ever be conquered by such a proportion of regular troops. Those who are best acquainted with the last successful resistance of this country against the British arms, will be most inclined to deny the possibility of it. Besides the advantage of being armed, which the Americans possess over the people of almost every other nation, the existence of subordinate governments, to which the people are attached, and by which the militia officers are appointed, forms a barrier against the enterprises of ambition, more insurmountable than any which a simple government of any form can admit of. Notwithstanding the military establishments in the several kingdoms of Europe, which are carried as far as the public resources will bear, the governments are afraid to trust the people with arms…”
He is quite clearly talking about the entire free population of men as the “militia” here when he mentions that 500,000 men at arms would be fighting. Granting that there was no census data and that Madison was not doing hard “number crunching”, this figure of 500,000 men amounts to nearly the whole of the free white men over the age of 16 in the new country at that time, or the entire body of of the country given the social and cultural mores of the time exclude blacks and women (Census of 1790 puts the number of white men 16+ at ~800,000 a few years after this article).
Madison doubles down on the idea of the entire populace being armed just a couple sentences later: Americans, he says, possess over the people of almost every other country on earth the advantage of being armed. He contrasts this with Europe in the next sentence when he says “governments are afraid to trust the people with arms”.
Now, leaving aside the incorporation issue, how can you square this sentiment–echoed in various places among the whole of the FFs–with the idea that the 2nd amendment applies only to an organized and subsidiary portion of militia that mimics the organization of the federal army instead of the citizenry at large?
I cannot. It seems self-evident that the FFs–whatever they may have thought about the States being able to legally regulate or disarm their local citizenry because of their strong preference for local governance–considered it a given and a right of the population as a whole to be armed. I can in no way reconcile this with the thought that they believed the right to bear arms appllied only to a subsidiary conscripted/enlisted state militia rather than the people as a whole.
If we accept incorporation as later courts do, then we must accept that they meant for the people as a whole be armed. If we do not accept incorporation, then while we may acknowledge that the FFs thought every State should be able to legally regulate its own citizens separately regarding arms, we must also acknowledge that they BELIEVED in the right of every voting citizen, or the “people” at large, to be armed and considered it self evident and a great advantage over other peoples in Europe.
In other words, I see original intent as twofold: first and foremost philosophically and secondly as a separate legal construct. Legally the FFs probably allowed that each state govern its own affairs and people as it saw fit. Philosophically as a matter of what the FFs believed, they saw that an individual right to arms was a natural right and self evident, the strength of the country and to be protected.
One can take the position that they meant for States to govern themselves and no incorporation should be applied: fair. That also means, however, that most rights people take for granted now (and specifically the more left leaning/gun control happy people) could be imperiously recinded in any single state. However I cannot come to the conclusion that the FFs actually believed anything other than that the right to bear arms was an individual right. Gun control people want to have it both ways, incorporation for some but not the 2nd, and I do not see that as possible.