Did you ever hear of the independent peasants' republic of Dithmarschen? It's not a state Crusader Kings would have playable. It's a Europa Universalis government. Dithmarschen was at the border of the Holy Roman Empire, so swampy and so remote it could use the terrain to repel feudal lords to retain independence. It had such a level of autonomy, it could stay in the Middle Ages into the 19th century.
TL;DR Dithmarschen, and also the members of the Frisian Freedom, was a literal farmers' republic in the Middle Ages. However, these aren't the same as what's being suggested. The upcoming clan government would probably be appropriate.
Regarding the suggestion, some events about the knights, which will be in the game, rising to nobility could possibly add some flavor.
Also, here is some info about the peasants' republic: https://www.reddit.com/r/AskHistori...id_the_free_peasant_republic_in_dithmarschen/
TL;DR Dithmarschen, and also the members of the Frisian Freedom, was a literal farmers' republic in the Middle Ages. However, these aren't the same as what's being suggested. The upcoming clan government would probably be appropriate.
Regarding the suggestion, some events about the knights, which will be in the game, rising to nobility could possibly add some flavor.
Also, here is some info about the peasants' republic: https://www.reddit.com/r/AskHistori...id_the_free_peasant_republic_in_dithmarschen/