My midwife suggests steaming your lunch meat when you bring it home from the store, then you can just put it in a new container and plop it in the fridge. That way it's all ready to go. I think the listeria mainly comes from the meat slicing mechanisms.
I will be staying away from lunch meat entirely. I have had food poisoning twice from lunch meat and it is not a pretty sight. Definitely heat it to steaming and if you do the whole package in advance, make sure it is in a really cool place in your fridge and eat it right away after you take it out. In other words, don't pack it and take it with you unless you can keep it under 40 degrees.