DougieP, cutting Snoke’s Force-sensitivity entirely is brilliant. It would eliminate the need for a payoff in IX, and might even make the “Palpatine’s still REALLY behind it all” reveal more satisfying. Implementing it would be somewhat challenging, but there are some options:

If Palpatine’s survival is integrated into the trilogy as a whole, it could be implied that Kylo accepts Snoke’s authority on Palpatine’s orders (similar to Tarkin being pretty much the only Imperial who doesn’t need to fear Vader).
A powerless Snoke communicating with Kylo via hologram could be a security measure, so Kylo never knows where he’s located. This would take some significant restructuring of Last Jedi’s throne room confrontation, but it could potentially be made to work by playing up the angle that the first time they’re ever in the same room together, Kylo seizes his opportunity and takes the shot.