Thanks for the info. Educational, as usual. I'm glad we can go straight to the source on these things.
DivestOS has own instace of F-Droid and they have .onion address to use it via F-Droid app. They have 3 mirrors within Tor (onion addresses). If you have no time to customise GrapheneOS or other custom rom just don't use it. It' safer for your personal data to use Iphone (consider lockdown mode) or Pixel with stock Android.