My pixel 7 is starting to get long in the tooth, I know I'll run it into the ground but I'm starting to wonder where I'll go for the next one now that Google is increasingly locking down their platform.

Motorola Signature 27, since that seems to be the phone that is going to support GrapheneOS? I have a P10P, but I'm very excited that they are working with a manufacturer that actually supports them. I'll most likely buy the Signature 27 at some point, just to vote with my wallet (even if the P10P) is still fine.

Whatever Graphene or Lineage supports. Google doesn't even have magic power over all phone makers, let alone all ROMs.