[platimus]

Interesting puzzle. I've never played Warhammer. I'm also not sure what you are proposing to handle the situation. I have thought about a similar situation in a game I was trying to create once upon a time though. Here's an idea...(you may have ruled this out already but throwing it out here in case you haven't)...

In terms of the battlemap and figures placed on the battlemap, everything is the same as normal TFT. In fact, the mechanics of attack, movement, etc. are the same as well...

Each Hero or Wizard on the map represents a squad of figures. You decide for yourself how many figures that actually is. The Hero is the leader of that squad. They do what he does. They all have the same basic characteristics as the Hero in terms of weapons/shields they are wielding and the skills for those weapons. You only need to create one profile (for the Hero) if using the Simple Version below. If you use the More Complex Version below, you'll need to create two profiles. One for the Hero and one to be shared by all figures under his command (same as Hero's stats but 1 or 2 points lower for each stat).

Simple Version
Each "Hero Squad" (HS) will have "Hit Points" (HP) equal to the Hero's ST times the number of figures under his command. When a HS attacks another HS, use the Hero's stats, etc. Each HS gets two attacks. One for the Hero and one for his squad. The damage inflicted by the Hero is doubled. The damage inflicted by the squad is normal. Deduct damage from the HS HP.

(More Complex Version coming in another post...)