You didn’t think about adding an option in the menu of something like quick battle (for example, as in the Total War series) in which you would choose:
1. The battlefield
2. The sum of points
3. Then the parties to the conflict (Undead, Mercenaries, House Army, Orcs, Goblins etc.)
4. Then you would buy units for battle (weapons and skills could be random) I think this is an cool option, and easy to add.