It's inaccurate that GrapheneOS fully endorses Signal and Tor. The GrapheneOS founder was blocked by Moxie (when they were still leading the project) for criticising their approach. They have also warned countless times about the limitations and weaknesses of Tor.
So you're against Signal, Tor, and Graphene, and suggest to instead use.. Lineage?
Don't get me wrong, I love Lineage, it was my first custom ROM, but this seems a little tinfoil