I've been thinking, for closing islands and enforcing character limit, how about putting a soft limit first?
Allow all characters from AT, FEI and BT to be on the island of their choice, but more character you have up more likely they will die. Let's say, if you have 4 characters on ET due to closed continents, since you are 3 characters over the limit, your characters are very likely to die from even a light wound. Also, not just from a battle wound. You can die from infiltrator attacks as well.
When you only have one character per continent, this obvious does not apply and only the standard rule of no character death rule applies unless your character is a hero.
