"Close border" policy as a penalty instead of an "invisible wall"

Currently, the "Close border" policy is an invisible wall preventing ships from entering the area of influence.

I suggest that the "Close border" policiy is instead a penalty similar to one of the Embargoes.

I'm not sure if it's intendend, but in the current version, ships can get stuck within your closed borders. It looks to me that when ships can't find space lanes which doesn't have a closed border system at their ends become stuck inside the closed border territory.

With the "Close border" policy as a penalty, the ships should be able to move away.