Performance Mgmt: Employee acknowledging appraisal

We are using R12.1.3 and have a business requirement for the manager to initiate an appraisal with approvals.  This will occur for the entire employee population over several weeks. 

Then at one point in time after all of the appraisals have been completed, the business would like to allow employees to view their appraisals (through Employee Self Service?) and their to be some type of tracking that the employee has acknowledged receipt of their appraisal.

I am a aware that I can use appraissee feedback so that a notification will go to the employee once the appraisal is completed; however the business need is for this activity to be delayed.