I know you said no Android roms, but GrapheneOS can be installed from a website over webUSB in just a couple steps. It's as simple as enabling OEM unlocking and

I know you said no Android roms, but GrapheneOS can be installed from a website over webUSB in just a couple steps. It's as simple as enabling OEM unlocking and clicking install - just make sure you have a supported non-carrier variant Pixel. That's the closest you're going to get to "install with one click". There is no preinstalled Google spyware or bloat