So I'll take one for the team and be the guy that breaks it to you. If you're looking for privacy, no. If you're looking to degoogle as a layman, also no. If you're looking to degoogle as a fellow poor, even more no. If your phone isn't listed on the options for Graphene then your just fucked unless you feel comfortable making a fork of an existing OS and doing 100% of the work yourself.
I myself was here asking the same question about 4 months ago and while plenty of people pointed me to maybe options, they all boiled down to "don't do this unless it's your passion project and you have a phone to spare. " Ultimately I managed to turn a few old projects around for parts and make enough to get some used pixel 8s off back market for an almost painless price so that I could get my family off the corpo list in one go.
If I come off as bitter or harsh, I apologize. I came into this with the hopes that I could make the leap and found that the leap involved doing literally everything I've avoided about the phone market since the galaxy 3 mini. Why the anticapitalist effort for free phones wouldn't base their system on a reliable and dirt cheap product instead of the branded icon of the enemy is beyond me.