Hello,
I really like what I see of your mod. I've just begun a campaign. I'm not sure of the faction limits. If there is still space to maneuver have you considered adding the Count of Toulouse (Occitania) as a distinct faction? The wealth and relative independence of the area seem to suggest this faction may, like those within the Empire, act as their own agents. It would also make Southern France all the more an open question.
Cheers