Dexter Fletcher never asked Rami Malek because he ultimately chose not to include such a cameo in the film, the reason being that as he said, it would be “too knowing.” While seeing Rami Malek’s Freddie in Rocketman would have been a hugely crowd-pleasing moment, Dexter Fletcher’s reasoning makes sense. Less a winking reference, this cameo may have come off a bit more hammer over the head.
Article source: https://www.cinemablend.com/news/2474868/rocketman-could-have-contained-a-wild-bohemian-rhapsody-crossover