I have natural white in several rooms and one in Antique White USA. I think Natural White will fit your needs.

I painted my unit in Natural White. It’s a beautiful neutral white and doesn’t throw any yellow tones.

Does natural white still have a warmth to it? We dont want the bedrooms to be too stark.

Yes Natural White has a warmth to it. It’s. It stark at all. But you need to paint up some swatches and try them in the bedroom.

I have a worker’s cottage that I painted a couple of bedrooms in the Antique White . I then painted the rest in Natural White as the other was too cream . I found that it was perfect as it is not stark at all but not dull . My home in the country which is built with verandahs and cast iron , I used the Natural . If you are unsure , get a sample pot of each and paint a decent section .