Your first post is a yes/no post. I'm ok with an open carry of an actual pistol, though that draws a small amount of attention. The argument being circulated by some in here is that AR pistols will be like when open carry first started. People got freaked out for a bit then it became somewhat normal to see people open carry. The difference is that pistols were never demonized by the liberal media like the AR has been and while the public knows that a glock 19 is a pistol they have no clue that a AR with a 4" barrel and a collapsible brace is technically a pistol as well. They see the gun that is on the news because it is so dangerous and used in so many mass shootings (really only a handful) and here is this guy walking a park filled with kids with one strapped to his back. This is why its counterproductive. I would say your "Don't draw attention to your weapon for any purpose other than defense" is close, but it would be better to say "Don't use your firearm as a way to get attention".
As far as physical capabilities go if you can not handle a pistol safely and accurately then you shouldn't be carrying a rifle for the simple fact that you might not have the use of both hands in some situations. While a pistol is easier to shoot one handed it can be done, a rifle (and yes, as dennis put it, a dressed down SBR passing as a pistol) would be extremely difficult to shoot one handed.
