Humanitarian Visa to Z visa

I am leaving my present school in Henan before my contract is up and I have provided the school with 30 days notice. It is a reasonably amicable but they are going to cancel my FEC and resident permit. I have a new job in Shanghai to look towards but as the school is cancelling my resident permit i cannot transfer it to my new school. I have been told to apply for a humanitarian permit and the begin the process of reapplying for FEC and permanent resident permit. Will the 30 day humanitarian entry permit allow me to this? Should I apply for this when I arrive in Shanghai immediately after leaving my present job? Are there any problems I might encounter during the process? Any help is gratefully received as i'm presently in completely unknown territory.