Flopped* Roman goes out to classically-minded non-conformists, on International Left-handers' Day. You know who you are....
You can write perfect Romans from the best models some 2000 years ago, without turning your arm or the page. Yes, they're simply a mirror image of right-reading Roman. Write them on the back of glass for signs; design wood blocks for printing; or just create beautiful calligraphy, scan it, and flop it.
*Flopped is a bona fide graphic design term, now described as "flip horizontal." The first specification I ever attached to a photo was "flop, crop, and bleed to the gutter."
Even if you write from the right, try today's flopped version just to give yourself a taste of what the other 15% has been coping with in a right-handed calligraphy world.