You should consider white dove for trim and under and Repose Gray for over trim and throughout upstairs hallway. Look how the darker color moves into the upstairs hall.

I came across this article from Architectural Digest and I think it answers all your questions. Eider White with Repose Gray with Bright White for ceilings and woodwork and Dovetail for the adjoing room. Kitchen has your colors in reverse, but none the less it is truly professional help from a respected publication: https://www.architecturaldigest.com/gallery/what-not-to-do-with-monochromatic-paint-and-decor

Not your desired response but the swap of counter and backsplash to light choices along w already light floors would accomplish nearly all your goal of a less dark kitchen. I’d absolutely do that wait on the expensive cabinet paint aspect. Walls can wait It’s just paint.

That was a helpful video nhb22 - I think the big question is can this space support light or dark cabinets? If you go light you can do COLOR on the wall. If you do dark cabinets you will want to go LIGHT on the wall (white /no color). If you did seasalt in LR and are happy with it it may need the kitchen area in a light white to balance that / make it all make sense and not be an overload of bluish green colors that are close in tones. I would argue that that dark gray cabinet is NOT a good family member to sea salt walls right near it. Why not stay on the sea salt color flute and go with something like SW Retreat or Pewter Green for the kitchen cabinets? Then you are staying within a family of colors. Origami white on the walls AND the uppers and soffit in the kitchen would compliment the Retreat / Pewter Green color and make the kitchen not too heavy and dark. Check it out.