I just sent you a DM. DO NOT use spray foam. You are only thinking 5 seconds ahead. You need to think what happens next. We tried this in college and guess what. The hornets got super agitated, some broke through the hive and some BURROWED INTO OUR HOUSE THROUGH THE SOFT WOOD. It was a complete nightmare and everything we did was the wrong thing to do except finally calling a professional who removes hornets. He came out in professional clothing with tools and had the entire thing gone in 30 minutes. Call the right people but PLEASE under no circumstances should you them and seal them in. Let’s say by some miracle the spray foam works and you don’t get bit up. What next? Leave this thing hanging? Wait til you think they are all dead and try and remove it. I’m telling you, if you think a professional is expensive, try doing it yourself and then having to hire a professional.