I would say its doable, I dont have all the stuff in front of me right now but
def ZoneEvent(self, direction, id, robot, chassis):
would be the section to add the code to
and then try
plus.eliminatePlayer(0)
in the brackets
0 for bot 1
1 for bot 2
2 for bot 3
3 for bot 4
since you have two bits of code for each robots scoring conditions just add the elimination of each player
you will have to try it out though im not to sure if that will work.