For the final showdown between Rey and Palpatine I kinda wanted more than the flashy overpowered lightning explosion we got.

I think if you change it so that earlier in the film Palpatine asks Kylo to bring Rey to him (under the pretence that Kylo and Rey will take the throne together), but then his plan goes wrong as Kylo turns good, so Rey then shows up alone. Really Palpatine wants to drain them both because he doesn’t have any intention of putting someone else in charge but needs to hear his body.

When Rey arrives she could be there with the intention of attacking him but he says about taking over her body if he is struck down in anger as his way of buying time for Ben to show up.

The main issue would be if Palpatine wants Ben there why would the Knights of Ren attack Ben in the first place?

I just think it makes Palpatine more threatening, more prepared, and would avoid him swapping back and forth and spending so long talking about family.