When a province goes inactive it would be nice if at the automated deletion date the monarch could instead choose to fill it with a new player provided he has an invite.
I invision it working something like this.
Monarch sees a province with a +. x days (i believe 5 is enough but maybe make it 1 week (1 year for those who prefer utopia dates)
At anypoint during the time he sees the plus he can choose to set the province to some kind of reserved mode. At the point that the province would be deleted for inactivity he can now instead be replaced.
It kind of sucks starting in a kd mid-late age, would be cool if these provinces could just be taken over.