We have a partial port of GrapheneOS to the Pixel 11 series after a week of work on it. We're unable to complete the port due to lack of support for ARM hardware memory tagging in software, firmware and near certainly hardware. It appears Google cut an important security feature to save money.
Same boat, I’ve honestly considered just buying a secondhand unlocked 6XL and installing graphene on it. I’ve not been happy with my 9.