Not to rain on the parade, but doesn't GrapheneOS only works on Google Pixel devices? I mean, that's still in the Google jail on a physical level, even if they swap out the software.
in any case, google started to cause issues with pixel 10, so it's not as easy to port it
There should be multiple 2027 Motorola flagships meeting all the requirements for GrapheneOS. They'll be providing official support for it and they're already working on porting GrapheneOS to their devices.
Google started causing issues over 20 years ago.