How about a bracket system? Get all the wabbits there an hour in advance and have them fight it out in a bracket. 2 or 3 wins should do it and it should not take more than an hour (especially if it ends at the 4 and 4 wabits advance to TOC. Any one latte disqualifies and the event continues as fast as possible.
I am against letting wabbits in the TOC since, well, they did not win but if we will allow them in, this seems fast and fair. Also, I'd like to add that # of kills is a very good measure since it shows that at list the guy did not avoid contact with enemies. As we know, one way to win the event is to avoid fights and arrive to them last so by using the number of kills as a measure, you give a reason to people to engage as often as possible.