Fiancé wants to find out the gender and I DO NOT... so here’s my plan

Long story short; my fiancé is a bit of a trickster 😉 loves a good prank or loves to stir me right up so I get all agitated and stir him back. He’s good fun. But when it comes to set in his ways. He definitely doesn’t like to meet me in the middle. Unfortunately finding out the gender... there’s no middle. I have my heart set on not finding out. He’s got his set on knowing. He’s told me he’ll find out and not tell anyone. Can I just say he will NOT be able to keep this to himself and I don’t want anyone else knowing especially myself. So I’ve come up with a bit of a plan.... but I would love everyone’s point of view on how to battle this subject. I considered a gender reveal but that means I still find out. I don’t want to know!!!

I was planning to get the doc to write in the envelope what the gender is (like he wants) and then take it to my friends to hold on to. My friend is going to write on another piece of paper and into an envelope MY guess and give that to him so that way either way we get a surprise. I’m either right or wrong so there’s no harm in it and he can’t tell anyone anyways so we won’t be buying gender clothes or styling our nursery any different 🤷‍♀️🤷‍♀️ I think it’s a great idea so we both get what we want kinda 😂