Blowing down the barrel was an excepted practice for hundreds of years.
If you really want to practice safety - run a "damp" patch between shots, not a dry patch.
As far as blowing down the barrel, (which I still do - as that's what you were suppose to do when I got into this sport/hobby) and the way I see it is;
I don't know how anyone could possibly mistake their muzzle loading firearm being fired off once they pull the trigger? If they can not tell this - IMHO, this is not the shooting sport for them.