Is side sleeping totally out of the question? I have slept on my stomach and side with this pillow, but on my stomach my head is turned. It is memory foam but I find it comfortable. I don't find it any warmer than a down pillow. But I like a cool pillowcase so I use a cooling pillowcase, that I also got on Amazon.
https://www.amazon.com/ZAMAT-Adjustable-Cervical-Orthopedic-Pillowcase/dp/B08ZD2JSWK/
I have a contoured memory foam pillow and I love it so much. I sleep on my side with another contoured pillow between my knees.
I’m not at home so I can’t look up exactly which pillow it is, but it’s similar to this one.
This is the only pillow that has ever helped my neck pain. ZAMAT Adjustable Cervical Memory Foam Pillow, Odorless Neck Pillows for Pain Relief, Orthopedic Contour Pillows for Sleeping with Cooling Pillowcase, https://www.amazon.com/dp/B08ZD2JSWK/ref=cm_sw_r_cp_apip_utL9iR4KpgQ7D
I also realized after a few weeks sleeping on this bed that I needed to replace my pillow to be much more firm than my squishy down pillow. Turns out that a firmer bed requires a firmer pillow to keep everything all aligned. I got this memory foam pillow which is perfect for back and side sleeping and not messing with my neck and I haven't slept this well in almost 2 years.
Another bonus of the avocado mattress - it sleeps MUCH cooler than our memory foam topped mattress. It may be the second best feature, especially for us in California.