Instead of enslaving players (say to safe won't happen), how about making slavery better?
You know, making them chop wood, pick up a certain item in your base or tent(like tell them to gather all ammo up or all weapons, etc.), slave that can lockpick at 100%, slave that can disable traps, some slaves already like trapper have 90-100 Outdoors which will help you avoid encounters when he's travelling with you (according to wiki).