Earlier quoted context omitted.
Motorola + GrapheneOS next year could be an alternative. So far they've been relatively insulated from the changes that have been coming down from Google.
I'll be waiting. In the meantime, I'm currently using a low end Motorola moto g 5G 2023 which lets me turn off Play Services. Chrome and the Google Calendar don't run (really do need to find a replacement calendar), and I couldn't be happier. Motorola's interest in GrapheneOS makes me wonder if they did this on purpose.
Calendar server: https://radicale.org/v3.html Sync: https://manual.davx5.com/
So, you run Radicale server, you can import Google Calendar.
Set up Davx5 on mobile to sync with the local server
Access from anywhere with Tailscale.