However, with the modification detailed in the post you linked, all I'd have to do is assassinate the family putz leading the swine
Then we can remove Assassins. And if not, you are talking about an exploit. If a player decides to use a mod that uses this concept then why would he destroy that concept by "cheating"?

Note that this is not necessarily meant to be the ultimate solution. It does make battles more climatic and it does make the game considerably different from what it is now, which might be fun for a change.

But I realize that this concept can only work properly if there are no obvious flaws that makes it apparent that it modded that way. Personally I couldn't care less and I would just disband entire field armies that do not have family members and I would clean up leaderless AI armies as target practice.