I also have always disliked Dooku having a lightning force power, for the same reason: It should be saved for Palpatine to show he’s the most evil of the Sith.

I have been toying around with the scene myself in the past. It’s easy to remove against Obi with editing but the problem is Anakin. I tried to switch the lightning into some kind of force wind type power by taking the blue color out and blurring the lightning bolts. Better result could be to remove as much as possible, as you have done Mxylv, and use some kind of effect on top of it.

I would like to see how far you can take the removal. It would be a valuable asset for fan editors if you are willing to share the shots in high quality.