Gender reveal for daddy

L • 🇬🇧 Mummy to a 💗 4yo 2015 💗💗 2yo twins (One stillborn 🌻) 2018 💛 Ectopic March 2019 💗 Baby due Sept 2020

So I’m thinking of pretending to the daddy that our baby wouldn’t open it’s legs for us to find out the gender (he isn’t able to attend the anatomy scan due to covid) and then surprising him and our girls in some way unexpectedly.

Can you suggest anything? We have three girls together and he also has an older daughter. He’s praying for a boy bless him!

Thanks in advance.