I might be wrong, but I don't think a warrior monk class is in the spirit of the game at all.
Eh . . . yes and no. Yes in that most people hearing 'warrior monk' would probably think of something fantasy or Asian, no in that many priests and bishops led troops into battle in Europe . . . not sure how many actually fought, but I'm sure some knew how to.
So, really, the fact that priests in the game can't lead troops at all is more against the spirit of the game's setting.