I guess usual advice if ever in shooting to avoid the cops shooting you in error, is to call 911, let them know this was SD, who you are (good guy) and describe yourself, clothes etc. Fine, but I can see times when that wouldn't work. An example:
You just described what we should do after a shooting, then gave us an imaginary incident where the citizen didn't do it?
How could you say it wouldn't work when the citizen in your scenario didn't follow the standard proceedures you described? Not to mention having a gun in his hand when the cops rolled up code 3.
I'm in total agreement, though, with your contention that if you didn't ID yourself to the dispatcher, and you have a gun in your hand when the cops arrive, you'll likely have a fast moving, exciting experience that you can tell your friends about--if you survive.