Nowaru

In Ninsharra, swap a point from military training for the much more useful "Precise Strikes" skill for the scout.

Yes, that's the kind of option I had in mind.
Why did I give up on stuns? - I'm planning to kill with attacks. Stunning a corpse doesn't make sense.
You can also give up on Ninsharra, military training, and even remove the beheading skill. Instead, take "Death's Embrace," add all the points from willpower to agility. Since I'm going last anyway, there's no point in trying. Just kill the one who won't die (probably). That way, I'll at least get a few turns.

Added 8 minutes later
Or put that point into "Grim Harvest." It's not like recharging beheading after 10(!) deaths was worthwhile, but the hit points could be useful.