Seems like you put a lot of thought into all of it, but I dunno. I feel like it’s more compelling to have the two main antagonists at odds with each other (Kylo and Palpatine). Otherwise Kylo is right back to serving another master because they both want the same thing (Rey brought before Palpatine). It’s really just a rehash of Episodes 6 and 8.
Whereas the plan we currently have is extremely straightforward and can be summarized in a couple of sentences:
“Palpatine wants Rey dead because he wants to possess Kylo unimpeded, but Kylo anticipates this and wants Rey to join him so they can destroy Palpatine together. When Kylo turns back to the light, he sets his sights on Rey instead.”