Forcing a certain playermodel on all TTT maps

On certain TTT maps, a model that isn’t from the default model pool is selected, such as the Mars Colony map, where it forces the playermodel to Kleiner.

I’m looking for a way to force the playermodel for everyone to a certain model, even if the map specifies otherwise. I know that there’s a place in the TTT core files about this, where it has 3 or so models that are chosen at random when a map starts that everyone becomes. That pool, as far as I know, is only referenced when the map doesn’t specify a playermodel itself, so it’s not helpful to me.