Right. Please understand, I have never put Rogue One into a NLE so I’m going by my imagination and imperfect memory alone.
What I would imagine doing, though, is to cut the Mustafar scene but leave all other mentions of Vader in the film, including Tarkin telling his stooge to inform him about the attack. (I don’t know how it would play, but potentially include the first few shots of the Mustafar scene to depict or imply Vader being informed and being dragged out of his bath to tend to this attack, leading to feeling particularly peeved at the end of this movie and beginning of ANH.) Vader appears as his star destroyer arrives, orders a boarding party, and mows down the troops in the hallway.