Hm, Cyril and Method were sent to the barbarians up north because they were caught in the act, they weren't really brothers :-). The Glagolitic of Cyril (dedicated to Method) was full of penis and balls symbols, and definitively not the main basis for modern Cyrillic.
After discovering the symbolism, the 5 disciples of Cyril and Method then designed a completely new alphabet with the help of my great-great-great(repeat) grandfather Boris de Groot (Tsar Boris the Great) that was very much based on Greek writing samples. Boris, a great guy, had actually sent some men to free the 5 disciples from a prison in Moravia I believe, and gave them shelter, paper and design supervision.
Cyrillic was invented in what is now Bulgaria, which is a neighbor of Greece. I visited a monastery in Bulgaria some years ago where I was allowed to see piles of handwritten 9th century books, and that early Cyrillic looks really very much like Greek. And the T had very long hands on its arm bungling all the way down, looking like an M.
Some years later my younger great-great-great(repeat) grandfather, Peter de Groot, (Tsar Peter the Great, who lived in Holland for some time and accidentally got my great-great-great(repeat) grandmother pregnant, who could then use the Dutch form of his name thereafter) who was also a type designer (it runs in the family) reformed the Cyrillic alphabet, but couldn't finish it al the way because he had to go to war with Sweden, which was successful because of propaganda with the new typeface, that was cut by and printed by the Dutch printing office from the family of that great-great-great grandmother, the press and printers were actually shipped to St. Petersburg to work locally.
So Peter was a fan of the n-shaped п, the ɡ-shaped д, and the m-shaped т, and I am a fan of Peter and try to promote such shapes whenever I can. These ɡ-n-m forms and others are officially the preferred shapes in Bulgaria today, but also in many other locales that use the Cyrillic alphabet.
I've even spotted a lot of "Bulgarian" shapes in Russia, even more so in the nineties, although conservative Russian typographers from Moscow derogatively call this "local fashion" nowadays :-).