The answer to all of your questions is no except for the governor's pardon. That is a long and arduous process, particularly for sex offenders, but if you were a heavy campaign contributor to any governor your chances may be somewhat improved. Do not try this alone; hire an attorney.
Your registration should not be publicly viewable.
Seth Weinstein, Esq.
Southern California Criminal Defense
This reply should NOT be considered a legal opinion of your case / inquiry. At this time I do not have sufficient factual/legal documentation to give a complete answer to your question and there may be more to the issues you raised then I have set out in my brief reply.
There may be a registration exception since there is a distinction between juvenile court and adult court for some sex crimes in California. I'm not certain if PC 264.1 is an exception. My understanding is that there was a law passed in 2006 that excluded certain sex offenders aged 14 and above from juvenile law confidentiality. So I suggest you contact an knowledgeable juvenile attorney in this area. Or retain someone to find the answer for you.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.