There are instance from the 18th century in politics of well regulated meaning regulated.
Here is one from Federalist 29 which takes a on your exclusionary take.
nice cherry picking of 29 to try and support your claim. Read in its entirety it the intentions are obvious. The militia is a state's check against a tyrannical federal government.
Federalist No. 29, by Alexander Hamilton (some paragraph breaks added):
If a well-regulated militia be the most natural defense of a free country, it ought certainly to be under the regulation and at the disposal of that body which is cons uted the guardian of the national security. If standing armies are dangerous to liberty, an efficacious power over the militia, in the body to whose care the protection of the State is committed, ought, as far as possible, to take away the inducement and the pretext to such unfriendly ins utions. If the federal government can command the aid of the militia in those emergencies which call for the military arm in support of the civil magistrate, it can the better dispense with the employment of a different kind of force. If it cannot avail itself of the former, it will be obliged to recur to the latter. To render an army unnecessary, will be a more certain method of preventing its existence than a thousand prohibitions upon paper. . . .
By a curious refinement upon the spirit of republican jealousy, we are even taught to apprehend danger from the militia itself, in the hands of the federal government. It is observed that select corps may be formed, composed of the young and ardent, who may be rendered subservient to the views of arbitrary power. What plan for the regulation of the militia may be pursued by the national government, is impossible to be foreseen. But so far from viewing the matter in the same light with those who object to select corps as dangerous, were the Cons ution ratified, and were I to deliver my sentiments to a member of the federal legislature from this State on the subject of a militia establishment, I should hold to him, in substance, the following discourse:
"The project of disciplining all the militia of the United States is as futile as it would be injurious, if it were capable of being carried into execution. A tolerable expertness in military movements is a business that requires time and practice. It is not a day, or even a week, that will suffice for the attainment of it.
"To oblige the great body of the yeomanry, and of the other classes of the citizens, to be under arms for the purpose of going through military exercises and evolutions, as often as might be necessary to acquire the degree of perfection which would en le them to the character of a well-regulated militia, would be a real grievance to the people, and a serious public inconvenience and loss. It would form an annual deduction from the productive labor of the country, to an amount which, calculating upon the present numbers of the people, would not fall far short of the whole expense of the civil establishments of all the States. To attempt a thing which would abridge the mass of labor and industry to so considerable an extent, would be unwise: and the experiment, if made, could not succeed, because it would not long be endured.
"Little more can reasonably be aimed at, with respect to the people at large, than to have them properly armed and equipped; and in order to see that this be not neglected, it will be necessary to assemble them once or twice in the course of a year.
"But though the scheme of disciplining the whole nation must be abandoned as mischievous or impracticable; yet it is a matter of the utmost importance that a well-digested plan should, as soon as possible, be adopted for the proper establishment of the militia. The attention of the government ought particularly to be directed to the formation of a select corps of moderate extent, upon such principles as will really fit them for service in case of need. By thus cir scribing the plan, it will be possible to have an excellent body of well-trained militia, ready to take the field whenever the defense of the State shall require it.
"This will not only lessen the call for military establishments, but if cir stances should at any time oblige the government to form an army of any magnitude that army can never be formidable to the liberties of the people while there is a large body of citizens, little, if at all, inferior to them in discipline and the use of arms, who stand ready to defend their own rights and those of their fellow-citizens. This appears to me the only subs ute that can be devised for a standing army, and the best possible security against it, if it should exist."