GrapheneOS now officially supports Pixel 9, 9 Pro, and 9 Pro XL | GrapheneOS is a private, secure mobile operating system with Android app compatibility, developed as a non-profit open source project
I used Graphene for a month. It was absolutely amazing, except from not having contactless payment.
The sooner they win their lawsuit against Google to get 3rd party OS attestation the better. I'll jump back in a heartbeat
Their camera app got much better recently, but you can also just go ahead and install the stock Pixel camera app from the play store, and use Graphene's network toggle to deny it internet access