I think this would be a little too much. Especially with Snoke and Luke, which I think would be confusing and unsatisfying for viewers. I did recently had some ideas for a Palpatine-less TROS edit that would also reinterpret bits of Palpatine’s scenes as a dark side vision.

But, I think the key is that you can’t use too much of it, and it would be better to cut it in a way that makes the dream-like quality of the scenes apparent.

My idea for these visions, though, would only be limited to being induced by the Sith temple on Exegol and Palpatine’s throne room. So it sort of follows of rules of the dark side caves on Dagobah and Ahch-To. There are nexuses of the dark side throughout the galaxy where physical locations can induce visions and hallucinations. I think this helps ground the visions, and makes it less confusing for people to differentiate dream from reality.

With that said, I think one could potentially edit the Palpatine scenes in TROS to try and make it seem like Palpatine is just a manifestation of the dark side cave. So maybe you could pull off cutting “undead Palpatine” from the movie without making major restructures to the plot.