Postmarketos boots on fp5 but lots if things are not yet working. I think, the main contributor is a Fairphone employee https://wiki.postmarketos.org/wiki/Fairphone_5_(fairphone-fp5)
I can't find LineageOS development progress, but Murena look like they will be selling the fp5 with e/os which is customised LineageOS, so its probably making progress.
CalyxOS doesn't support the FP5 yet but they are working on it.
I have been using it for like 2 years and the only thing I miss is a sensor permission like the one from GrapheneOS.
literal liberalism, it's putting lipstick on the pig that is android, the entire system is built from the ground up to be a surveillance nightmare.
Postmarket OS should work but you'll be better off getting a used Oneplus 6/6T and waiting for camera support (soon (tm) )
Patches for the kernel that make the camera work exist, even though they haven't been accepted into the kernel you could just compile it yourself. Maybe I'm not the best resource though, I hard bricked my 6T two days ago. Ubuntu Touch is also an option, it has camera support because it uses an older more custom kernel.