Funnily enough, this obscure dispute may have been the inspiration for a very modern work of art.
In the game Elden Ring, there are mysterious entities known as the Two Fingers and the Three Fingers. The Two Fingers are well known and respected parts of the church of that land, while the Three Fingers are a secret, heretical cult.
And the Two Fingers is in fact a literal set of two fingers, which seem to be the index and middle finger, corresponding to the fingers used in the Old Believers version of the rite; while the Three Fingers is also a set of fingers, with a thumb, index, and middle finger, also corresponding to the fingers used in the modern rite. It's somewhat likely that they are inspired by exactly this huge dispute in Eastern Orthodox's history.