Just get two smartphones. One running GrapheneOS and no Google apps for your personal stuff, and another stock Android phone strictly for things that demand a normie phone. The personal phone can be wifi-only, even a tablet.

Some people have resorted to using special cellular WiFi hotspots to run their non-cellular device. You can run your calls through something like that. The CalyxOS foundation makes a WiFi hotspot like that, but I don't have one. That may be the ideal one. Maybe something can be done with Starlink but it's not as portable.