More generally I think it's time to consider the possibility that the Second Amendment is simply poorly written and this, not anything ideological, is the lion's share of why the prefatory clause is such a minefield. That first comma really throws aspiring constitutional exegetes for a loop.
The overall document is pretty shoddily written (which is not surprising: everyone involved was functionally an amateur, professional standards not really existing in North America at the time), but that particular section is egregiously bad and subsequent attempts to insist that that's just the way Eighteenth Century English was and that, actually, it is perfectly clear are entirely pathetic.
