Being a "big Beyonce fan" and immediately picturing an afro is...a reach.
In Beyonce's entire 24 year career, spanning albums, videos and movies, she has worn an afro once, and that was for the movie Austin Powers: Goldmember, that came out 20 years ago. Well, she also did promo for that movie with an afro look dressed as her character. But still, that's such an obscure reference and I doubt it's what your friends are thinking. MOST Black folks are going to find it basic and comical at best, insulting at worse.
That said, if they got a honey-blonde afro, 70s costumes, and went FULL Foxy Cleopatra cosplay, that would be a serve.