I like your general scenario for dealing with this scum with one exception.
"The judge might give me a medal". The judge may also slap the cuffs on you for intentionally endangering the physical well being of the scammer. You could be cell mates. You had the options of not answering, hanging up or playing out your skit without doing any physical harm. Any of those would be a better choice. You can't claim the use of the air horn was self defense in this case.
There are some crazy judges out there as well. Remember the burglar who sued for injuries sustained when falling through a skylight? The homeowner lost that case even there was no intent to harm the burglar by causing him to fall through the skylight. It was purely an accident, yet the bad guy won.
Let's work together to put the bad guys in jail and not the victims.