It seems like a good idea to add parts of TROS to the earlier films, to make Palpatine fit more naturally into the trilogy. But I don’t know if I would personally move big reveals like that. It could work, but I think if they are taken out of context the impact might be lessened. The reactions of the characters don’t quite match and the information we learn isn’t made relevant until a later film. Like if we would see Palpatine in TFA but he is mostly irrelevant in TLJ, then I’m not sure if that works for me. But I guess that depends on how you structure the trilogy as a whole, with enough changes throughout perhaps you can move plot points without making them feel out of context.