Well, a client-side GUI that asks you if you want to leave, and THEN does the forced disconnect and reconnect, use the password as a Very Long String containing player data about spawning and such, that is passed to the GUI before you redirect from the other. You could also have it store yourr current state password for each city-server so yo can go between them. The hardest part will be passing your internal state between servers for password checking and stuff.
Also, the datablock load remover is a Good Idea for such a thing.
