Never had graphene, but been using Lineage since it was called CyanogenMod on my Galaxy Nexus

Thats the trick, when a company supports romming, you can extend the support for however long you want!

Just a PSA. For voip to work you’ll need something like Coturn (TURN signaling server) which needs a gaping hole in your firewall. We ended up using mumble for ingame voice and jitsi meet if we need the other stuff (screen share, videos, whiteboard, etc)