I dont think there is a way. 90% of the tracking is performed by the OS itself. That’s why the first thing you have to do is log into a Google account so they can immediately begin tracking you, and that’s why they lock the bootloader.

Funny enough, one of the few devices that allow you to unlock the bootloader is made by Google.

https://thenewoil.org/en/guides/quick-start/mobile/

I used ADB for years, but I recently started using two Android apps, Canta and Shizuku. With these two apps you can uninstall any app (even the hidden ones) directly from your phone without connecting to a computer. I can be a little tricky to set up, but it’s by far the best and clearest method for uninstalling bloat and spyware from your phone. Even better than Universal Android Debloater (which is still a great option).

Fwiw

1. You should use a VPN or an tracker blocker like DuckduckGo. This is the only way to slow down the information you are sending out. You might not be able to completely stop Google and Samsung from tracking you, but there’s no reason to share yourself with all other data harvesting services.

2. You have to obfuscate the info that makes it through by using multiple, unlinked Google accounts that let you put separate components of your life into separate silos.

For bloatware, this is what I use if you have access to adb https://github.com/Universal-Debloater-Alliance/universal-android-debloater-next-generation/

As for privacy, I cant think of any approach for base roms aside from piping your connection through a vpn that screens every IP or domain from that device whatever it reaches to. Unfortunately, I dont know any vpn that could do that.