I completely love that mock-up, RL!!!
The premise of this thread sounds very interesting. Because of that, I wanted to brainstorm some ideas as well (though some were already suggested on other threads by other editors):
-Vader mentions Padme during his scene with Luke (through the line “Your mother once thought as you do”)
-When Vader lifts the Emperor, an slight “bone crack” sound effect can be heard (like in the novelization for ROTJ, where Vader breaks Palpatine’s back before throwing him)
-Add Palpatine’s spin scream from ROTS (or maybe his laugh) when his body explodes, in order to suggest that his essence left his body and went “somewhere else”
-Snoke’s voice lines from TFA teaser trailer could be added at the very end of the credits (similar to how Vader’s breathing was featured at the very end of the credits of TPM)