Well regulated also essentially meant "competent" then as well. So it could be interpretted as "so our militia can have enough firearms practice to shoot straight and know how to fire, maintain, and reload the right to have gund shall not be infringed".

Essentially like a justification for public schools and compulsory education being "literacy is essential to function be an informed citizen which is needed for self government". Just like how merely being able to shoot well isn't enough to be a good soldier but it is important.

"well regulated" meant able able-bodied male of adult age. Your definition is likely far more constrained. "practice" in this sense is not generally mentioned, as they were required to own a conventional firearm for the time.

As to "training," there wasn't a regimen of regular firearms training per-se. It was generally considered common knowledge to know how to load and fire one's musket. As to any comparison of modern training, it seems to me like today's police, at least in major cities like NYC receive less training than a typical gun owner outside major cities.

I meant it as unconstrained actually - the rationale and the right are separate things. Essentially unrestricted for the sake of practicality. Thus two separate points.

1. It is important to have a populace capable of using firearms. 2. The right to bear arms shall not be infringed.

Of course the interpretations are for better or worse living in practice regardless of plain text - freedom of the press still applies to internet and unfortunately the special pleading of obscenity laws have survived for centuries.