Glad to hear you are safe, and without major injury. As I am now on a C14, I truely understand the reasoning for that "flash-to-pass" convenience that came standard on my bike.
I, like you, feel visual attention by the opposing drivers as a means of better avoidance then a horn blow, seeing as most folks simply do not respond to the horn at all, when oncoming. I am all over the flash button when someone breaches my lane, flashing my dual lights at them like a laser beam, shooting at my enemy.....
I have also taken the further motion of once I get thier attention, pointing down to the centerline of the road, and while looking them squarely in the eye, rapidly draw a visual line back and forward repeatedly showing them the freaking line they crossed.
I know it's hard to comprehend for some, but for years while living in Va., where everyone crosses the center on the back roads, it was an excercise in futility educating the same offenders day after day, that I met on my backroad commute. I have had some repeaters that I had to do this to for weeks on end, before they got the hint, people that persitantly rounded blind curves in the road, only to meet me damned near head on, with me riding 3 feet from the right edge.
Sometimes I wish terrible things upon those people that were so stupid, and arrogant in their driving, to have them round a curve and meet a semi face to face, or maybe a huge farm vehical with a monster cultivator behind....
Many of those roads I travelled had hundreds of brake skid marks, fully in the opposit lane, showing that even when they hit the brakes, they were still travelling FURTHER INTO THE OPPOSING LANE....simply unexcusable.
I'm glad you took the time to go to the P.O., and force a ticket on that person, maybe they will need to be jobless, and try to get another job that doesn't require using the vehical for work, in order to get an "education", and wise up before someone is injured badly.