I hear you! Hardware fragmentation is a serious issue, very difficult to deal with as a small team, so I can’t hold it against them, but I really wish I had been able to put it on my old Note 9 instead of buying a Pixel 😑 (doesn’t have to be a Pixel, there are other supported devices, but it’s easiest and works best)

Have you tried CalyxOS (https://calyxos.org/)? Review from a year ago seems pretty good (fair warning: Reddit link). I’m keeping Calyx in my back pocket in case Graphene goes tits up.