Sounds like the easy way to go is to get an older Pixel and install GrapheneOS or go to an electronic store and just by a phone do degoogle. Any of these other phones, it all comes down to finding the right model and configuration, and if you don't have the right specs, you cant download a ROM on them. Thats why for my main phone I just bought it preinstalled, because finding those types of phones are getting harder to find and they're not easy to find.