We're talking pretty abstractly about gun regulations, which makes it easier to straw man these conversations. So here's what regulations I'm for. Blacklisting people with misdemeanor domestic violence convictions, requiring higher levels of training specifically on the when deadly force is and isn't appropriate, requiring licensed carriers to purchase liability insurance, some reasonable waiting period that's likely already law. Much like the crowded theater analogy,
You still don't understand the crowded theater exception to freedom of speech at all. That exception is made because it creates an immediate risk of harm. Meaning, once you yell fire in a movie theater, no other action is needed for harm to now be created.
Your comparisons with gun regulation do not compare in any way to that exception for freedom of speech. If you want to bypass the constitution your trying to do it the wrong way because of a lack of understanding of constitutional law. The act of selling a gun without any regulation or giving a person a gun does not create a immediate risk of harm, because there has to be additional steps taken to create harm to any person. Are you understanding the difference? If you want to ignore the constitution feel free, but you're going about it the wrong way.
I disagree with your regulations too. You shouldn't blacklist people with misdemeanor domestic violence convictions. Misdemeanor domestic violence at least in the State of Missouri doesn't even require a person to make physical contact with another person. All it means is that you placed a person in immediate apprehension of harm. Many of which cases were two people arguing and one thought they would gain an upperhand by calling the police. I could understand felony domestic violence because that requires some sort of actual physical harm being done to another person. But we already have felony laws for that reason.
I guess I can sit here and pick apart the rest of your proposals but waiting periods are fine. I don't really take issue with that. If you're going to a store to buy a guy, I can't imagine a scenario where you would need it immediately. Training is a waste of time and I think it would be abused pretextually to prevent individuals from being allowed to have a fire arm. Insurance companies already rape America, I'd prefer not to hand them another item where they can take everyone's money and almost never have to pay out on a policy.