I don't have any similar experience, but I know that when we gave notice, everything was done via email. We had to take proof of our residential address, but nothing was posted to where we live. The fact that we had given notice was passed on electronically to our registrar, and we received electronic confirmation that everything was ok. You could always check that your local registry does the same, but I'm sure it will be, just give them a call and explain that you have privacy issues at your current official residence and would like all contact to be done via email or phone. I'm sure you'll be fine.
I hope this helps, and sorry you have to go through this! Best of luck! X