None of us are that far apart on this issue, so let me hit and run.
The issue should not be Constitutional carry (bad guys already exercise that right), but rather the question of a bearer’s responsibility to the community.
Think in terms of that yellow school bus behind the bad guy. Even if it is a justified shoot, training, practice and clear thinking can help to avoid a tragedy.
My solution? Every adult can carry concealed but if circumstances (i.e., a shooting or even a presentation in connection with a citizen’s arrest) should warrant a request by an LEO, then the shooter better be able to present a pocket card that certifies proper firearm training. Failure to present such a card would result in a meaningful fine or perhaps in some events even jail time.
In my opinion, the training most states presently require for CCW at the best is probably no more than half of what is needed.
I believe you’ve explained your idea before to me, on threads where I was objecting to the potential registration nature of a training requirement. I like it. I don’t see why it would present a problem.