Thanks for the reply, Warmaster, and no worries about thread death here.
To your first point, I agree, but I need a way to differentiate from ATSKNF. I want the rules similar and equivalent, but not equal.
To your second point, I don't want to do (Characters) because you can't direct attacks against sergeants and the like, so part of the rule would be useless and even if you could it would go against the point of the rule thematically. I have (HQ units) because the death of an infantry unit in a leadership role, such as a Company Command Squad or an SM Honor Guard Squad would be thematically and mechanically important.