"The Cyrillic script has weird origins"
Not really.
The Early Cyrillic alphabet was developed during the 9th century AD at the Preslav Literary School in the First Bulgarian Empire during the reign of tsar Simeon I the Great, probably by DISCIPLES of the two Byzantine brothers[6] Saint Cyril and Saint Methodius ( byzantine scholars from Thessaliniki), who had previously created the Glagolitic script. The Cyrillic script is named IN HONOR of Saint Cyril (by the disciples who created it and translated the first important works) in the 890s (9th century) as a more suitable script for books in Old Bulgarian (later called for political correctness "Old Church Slavonic"). This was primarily done in the Preslav Literary School (in northeastern Bulgaria).
The credit goes to the seven most prominent disciples of the two saints, but primarily to st Clement of Ohrid & st Naum of Preslav (aka Kliment Ohridski & Naum Preslavski).
(Christian emissaries later brought it from Bulgaria to Kiyv not long after as I recall. And as we all know, at that time Moscow did not exist... Sometime later Bulgaria fell under the Ottoman Empire for five centuries and did not stand a chance... Yet what had reached the Kievian Rus lived on... as you know... Yes, a Russian tsar threw out a bunch of letters at some point…)
(So much of Eastern Europe’s history has been… “edited” after WWII… I know.)
(Christian emissaries later brought it from Bulgaria to Kiyv not long after as I recall. And as we all know, at that time Moscow did not exist... Sometime later Bulgaria fell under the Ottoman Empire for five centuries and did not stand a chance... Yet what had reached the Kievian Rus lived on... as you know... Yes, a Russian tsar threw out a bunch of letters at some point…)
(So much of Eastern Europe’s history has been… “edited” after WWII… I know.)
https://en.wikipedia.org/wiki/Cyrillic_script
https://en.wikipedia.org/wiki/Early_Cyrillic_alphabet
https://en.wikipedia.org/wiki/Preslav_Literary_School