A Certificate of Rehabilitation is a court certified document declaring that a person is now obeying the laws of the land and demonstrating good moral character.
A Certificate of Rehabilitation is designed to restore civil and political rights of citizenship to ex-felons (and some misdemeanants) who have proved their rehabilitation. People v. Lockwood (App. 1 Dist. 1998) 77 Cal.Rptr.2d 769, 66 Cal.App.4th 222. Subsequent good behavior or rehabilitation may be considered grounds for relief from sex offender registration requirements through the means of a Certificate of Rehabilitation and/or pardon. People v. Garcia (App. 2 Dist. 2008) 74 Cal.Rptr.3d 681, 161 Cal.App.4th 475.*
Certificates of rehabilitation are an essential resource states can offer to support reentry – and thus promote public safety – by lifting statutory bars to jobs, licenses or other necessities such as housing that result from a conviction history. Certificates may be used to provide a way for qualified people with criminal records to demonstrate rehabilitation or a commitment to rehabilitation. However, only six states–Arizona, California, Nevada, New Jersey, New York, and Illinois–currently have laws authorizing certificates of rehabilitation or other similar means of removing legal barriers arising from a criminal record separate and apart from seeking a governor pardon, which are rarely granted in many states.
Currently there are two States in America which allow you to apply for a Certificate of Rehabilitation that is designed to restore civil and political rights of citizenship to sex-felons. SDSC Form #CRM-210
It would seem simple enough to replicate this and submit to your County for restoration of rights, in hopes that the County would not grant restoration but in the least foresee the practicality and reasonableness of the document.
You might like reading sucess/failure rates on CA COR here: http://californiarsol.org/2013/04/certificate-of-rehabilitation/