[Skyld]

Check if the player's X and Y is either <0 or >64.
Check the level name aswell. If your level name format follows mapname_horiz_letterverti_number.nw, then you will be able to script it to work out the level they are about to walk into, and then warp them there by triggeractioning to the serverside, and using setlevel2 to put them where they need to be.

In theory it would work, although in practise, I'm not sure how well it would perform.