Hi burntsienna,
While this site focuses primarily on mattresses, there is a pillow thread here.
This site has a photo of a Therapeutica sleeping pillow that I’ve seen before in polyfoam and latex configurations, and it is popular for use after people have neck surgeries. You may be interested in something like that.
Perhaps there are more knowledgeable people who have experience with a pillow that is similar to what you describe and they can provide their insight as well.
Phoenix