I am not sure it is a procedure you need, rather a contingency plan, if your existing PPAP procedures fails to deliver PPAP on time. I do agree however with Howard, in that you should not be planning to fail, but rather investigating the causes behind why you have previously failed, and tackling these in a revised procedure.
Back to the original question though, if you need a contingency plan, it should start and end with communication with the customer. Always ensure the customer knows in advance that you will not meet with the deadline, have clear reasons why not, ensure you agree a revised deadline that is realistic and satisfy all of the customers requirements in the interim. Most customers will have an interim submission requirement, if you are not going to make a full submission deadline. I always find it useful to offer them this option on the basis of full approval being obtained upon completion of the required level of PPAP information.
Hope that helps.