I like this idea a lot. It is an ambitious idea. If you want to pursue this, I would get a hold of Bradly Klein pn youtube to see if he could help you with a Snoke impression.
You could even keep the Krait sequence (since Luke looks younger.) You could probably re purpose some episode 9 footage along with some episode 8 footage to have Rey and Leia talk about Luke being dead. Confirm that what Snoke is saying is the truth, but then pull a surprise in the Krait sequence.