Stop Ships from entering specific sectors

[MrKincaid]

I am looking for a script where I can set some sectors as forbidden for all my non-player ships. The problem is that my universe trader, my complex freighters and my explorers keep going into the war sectors and die. I have the enhanced trading software mk3 where I can forbid the universe trader to go to these sectors and I use the CAGs to buy and sell wares for my complex. This also allows me to forbid these sectors for them. But there is still the explorer left. From time to time he comes to omicron lyrae or another sector around and before I can even respond to his message he is destroyed. I can't find a way to forbid these sectors for the explorers. Is there a script or something to do this or do I just have to save often and load the last savegame when he got destroyed again?