I just went through the whole thread and stumbled over the argument about warrior priests and chaos warriors.
How about the idea of being able to recruit one or two Warrior priest/Chaos Warrior Champions/Witch Hunter ect. as a Hero character?(Maybe even depending on lvl.As if earning respect/fame/reputation)
As these characters are more or less elite troops in the Warhammer game.
Regular troops could be made up of Pikemen/Swordmen/Great Swords/Marauders/Chaos Warriors.
As i said only an idea,but it would make these troops special.