Oh hun, I totally feel you on this! I had a horrific experience trying to get my form signed. Here was my story

I hope you have some luck finding a GP that is supportive! If you end up seeing one of the council vaccination nurses, my suggestion would probably be to be quite frank with them to begin with. Maybe start by telling them you understand that they have to inform you of the risks of not vaccinating, and that you already know about them, but that you also understand the risks and it's your decision at this time not to vaccinate and you want them to respect that decision. I wish I had been more forceful when I met with them because they may not have been so horrible to me. Good luck!