Well when Kylo does have the flashes of Han dying he does hear Luke say “you killed him.” Granted it’s reused from ESB but there’s still an element of Luke contacting him I think. Maybe have that line ring in Kylo’s head throughout the movie?

I think giving the Han/Ben scene to Luke kinda discredits Leia’s purpose there. In original scene, Leia wants to save her son so she grabs Han’s old medal and sacrifices herself to reach out to him. Han’s presence is her doing, and she would likely be there beside Han had Carrie Fisher not passed. If Luke’s the reason Ben sees Han, Leia just kind of dies and that’s it. Unless there’s a way to maybe have it explicitly obvious that Luke is helping Leia reach out to Ben? I’m not sure, but I do like the idea I’m just not really sold on it.