There is still a unique opportunity for TW to turn the Embers of the Flame into a crusader-like MINOR faction. Having Embers of the Flame and Beni Zilal being a direct opposites to one another (secretive, almost ocultist organizations) would be something i would personally enjoy, perhaps even starting the game by being at war only with one another.
Its a minor faction that already exsists, only a 3 unit troop tree would be slighly altered, and their current lore would fit the crusader/monk appearance.
1st crusade being in 11th century, which is just about on the upper margin for Bannerlord`s historical inspiration, gives little room to full-out crusader equipment, full helms and such. Just some monk robes over chain hauberks and spangenhelms with noseguard would suffice. Even though it is the Empire`s minor faction (culturaly different), there are already Eleftheroi that are different, so Embers of the Flame could go similar path.
I thus disagree with the idea of having it as a MAJOR faction, with pop culture "Kingdom of Heaven"-type of crusaders look, and especially not in that part of the map, it could be much better used for some potential african,indian,persian major faction, or other.