Hindu_Iranian Muslim Marriage

I'm an iranian girl and muslim. I wanna marry a hindu guy. He is ready to convert into islam, but can't change his name officially cuz of his business. I don't have any problem with his religion and he doesn't have with mine. Just cuz of iran gov rule that a muslim girl can't marry a non-muslim boy, he is ready to convert. But my family doesn't accept him under any condition and even don't want to meet him. Right now I'm 29 yrs old and single. In order to get visa and leave country i need my dad's permission and signature, but he ll never sign any paper for me to leave iran. I just need help to see how we can marry and get our marriage registered and where? Cuz i've read that if we marry without iran gov permission, there ll be punishment. I also don't want to convert as hindu and my bf also accepted that. His family also know me and don't have any problem with me. I have talked to his mom several times. Our relationship is more than one yr, but only online. We haven't met each other face to face yet. I'll be happy if i can get help.