you should definitely have everything you need from them (financially, health care, etc) in hand before discussing. assume they will ask you to leave immediately. if they don't and you are able to give them the time, I think it is a classy move to help them out. but that should not mean do a bunch of crap you don't want to do (like perhaps onerous documentation). you could offer to be a consultant for a time if they need to use you.
We just don't let them use low ports. They have to bind to something over 1024 (we have a allocation based on app id). If they are surfacing an web site or that needs port 80 or something else like that with direct user connections the load balancer will do the port mapping when it forwards the requests.