I’ve actually suggested a similar idea before, but you could potentially replace Anakin killing the Separatists leaders with Anakin killing a group of Jedi that have rendezvoused on Mustafar.

First, you would have to cut Palpatine telling Anakin to go to Mustafar after he has killed all the Jedi in the temple, and then Anakin telling Padmé that he is going to Mustafar to “end this war”.

Instead of Anakin calling Palpatine after he’s killed the Separatists, you could replace that hologram with a Republic/Imperial officer telling Palpatine that they’ve received reports that a group of Jedi have been spotted on Mustafar. Then, Anakin just tells Padmé that he’s going to Mustafar for a very important mission.

This would be the hard part, but you could potentially have actors dress as Jedi and film in front of a green screen, then create new shots to replace them with the Separatists. You could even have someone dress as Anakin, and since Anakin has his hood on in this scene, you could just avoid the body double’s face.

Though if you were going through all of that effort, it might just be better to make a “Darth Vader hunting Jedi” fan film.