I agree that the BFII footage looks too “gamey”. Besides, I thought one of the main points of adding extra shots to the beginning of the movie was to establish that the scene was happening on Mustafar but in the end, it doesn’t really help with that. The pacing isn’t really improved either so only keeping the TIEs flying over the forest might the best choice here.
By the way, someone (I’m really sorry, I can’t remember who) posted a long time ago this shot of a burning forest :
https://drive.google.com/file/d/16cnCdeeaUxCWBJ9CuNXobrsX7j6qJ03h/view?usp=sharing
I feel like the color grade is really coherent with the movie scene . Maybe adding some TIEs flying in this shot could work ?