You are right, I had it a little backward. The e foundation makes /e/OS, and they sell a murena fairphone 5 with the OS preinstalled. So you can get a fairphone thay way, or just install it yourself.

https://e.foundation/e-os/

Fairphone uses their own custom OS to degoogle things and help ensure privacy. I dont think its perfect but its about as good as it gets. Otherwise you can buy a google phone and degoogle it with Graphene

Do all the harm