I’m asking myself whether it is actually possible to achieve this in a fan edit.
We could use the scene of Anakin and Padmé arguing on her ship after they retransmitted Obi-Wan’s message as a starting point, paint her out of most of the shots and then add a little hologram of Palpatine to the console.
To finally sell it as a new scene we could replace the background outside the ship with a sunset.
In this video someone did this for the R2 receiving Obi-Wan’s message bit: https://www.youtube.com/watch?v=jhCnW79f-z0&list=PLrrjPYdsCSWraGbJBLRd_YrWuHUyJOdAf
(around 5:15)
Maybe we could even delay the reveal that it is Palpatine that he is talking too, this way the audience might assume that it is Obi-Wan at first.
I only wonder what dialogue to chose exactly. Maybe like this:
-Opening shot of Amidala’s starship
-Whatever can be pieced from Anakin’s line. Here lies the real challenge because a line has to either fit the existing footage from the scene on the ship or we would have to rotoscope him out of the garage scene and fit on a background that matches the geometry of the ship.
-reveal Palpatine to be the person Anakin is talking to, he could say something like this:
“It is only natural, they took your mother and you wanted revenge”
Now that I think about it, I feel like I read about a similar idea in the Prequel Radical Redux thread.
Edit: If we go with the sunset idea, we could also use shots of R2 and 3PO arguing on the ship after they landed on Geonosis, color wise they would match a sunset.