It would not be difficult to create a campaign script that runs only once (at the start of the game). That is what XGM does. Just put a line at the bottom of Descr_Strat saying:
Code:
script
{script file name}
Then create a text file with the name you pointed to and put a command in there to kill off the starting King.
I do not like the scripts that run all of the time, which you have to start every time you reload a save. But this sort of campaign script is a fantastic way to help balance the game. I use one in ATW to give bonuses to all of the non-player factions at the beginning of the campaign. That way the player has more of a challenge.