With respect to your number 4, I pack a couple of key locks (that are open and unlocked, and with no key in the case) and a couple of opened dial combination locks in the case with the gun along with a note for TSA to feel free to use them if necessary. I also have my name and cell phone number in the gun case. Although I always wait until TSA has cleared the luggage, you never know if something will cause an alert later.
I also keep the locked handgun case inside a regular piece of luggage so that no one knows a gun is in there when it comes through the baggage conveyor system.
