Outpost Shifts and Supplies

My idea is to add a crew transport system to the cargo ship system. I envision it working like this:
* All outpost crew must be transported to their respective outposts via the same cargo ships that collect from said outposts.
* Crew are brought in and out in shifts -- when you assign e.g. 80 workers, only 40 of them are actually on the outpost at any given time. The other 40 are resting at your main settlement and unavailable for work.
* Cargo ships also bring food, medicine, and other supplies.
Under a quarantine edict, ships are no longer allowed to travel. That means that, while they are free from disease, all your workers currently working in outposts are stranded, with limited food and supplies. You can tell them to stop working, in order to make their supplies last longer, but eventually they will start to feel pressure. If they run out of supplies, workers' unity bonuses will diminish, and eventually they will start dying.