I'd change the movement characteristic to that of the armies' standard movement - if they're in an Elf army, you don't awn't M4, if their Dwarfs, M5 would be pointless. I agree with
HawaiiMatt on how the Attacks are determined, but if you still wan't a set number of Attacks at least reduce them - to 6 or 7. I was inclined to say to reduce the
D6 ranged attacks to D3, but then I noted that that includes the Wizards spells. My bad

. I think that it should be a Lord or Hero choice. I can see how a council several races could act as a single commander - combining their tactical knowledge and leadership to act as a one general. In that case they'd be Leadership 10 to represent their combined authority. I'm quite partial to this idea. As they are a Lord/Hero, they could join units (much like Skarsnik and Gobbla). Points . . . around 155 points - in which case they'd have to be a Lord's choice.