I never once in my life saw that kiss as even remotely romantic!
There’s not really a love triangle even in Empire. Lucas might have thought there was one, but again - the first thing Leia says when she wakes up Han in ROTJ is that she loves him. So even if anyone wanted to read that bedside peck as her taking the opportunity to express her romantic feelings for Luke, the question is effectively dead once Leia rescues Han.
Also there’s the fact Leia never once says anything even close to that to Luke in the Trilogy. She says “I love you” to Han twice, but the one time she admits she does love Luke, Han is the one who says it, to HER, and she laughs like “Yes, but as a brother, dumbass.” There is one scene of open attraction from Leia, towards Luke, in all of Star Wars, and it got cut out in Empire Strikes Back.
Kasdan I think knew the idea of the love triangle was dumb, and knew he’d solved that problem in the prior movie anyway, so he did what he could to present the facade of one to please George but never at any point wrote the characters to behave as if there actually WAS one in play.
It’s so easy to remove the subplot, too. Just cut from “Hey, what’s going on to” “Hold me.” and that’s one part of it completely gone. The other part, on Endor, simply necessitates a shot of Han looking confused and questioning after she says “He’s not. I can feel it.” If you can cut to Han looking goofy (pick a reaction face, he goes through like 3 of them in that scene) after she says that for a second or two, you can just cut back to Leia laughing and saying “He’s my brother.”
Scene plays out as intended. Both scenes are now dramatically consistent with each other and make Han less of an idiot while still making him humorous.