One possible option would be to install Netguard (open source Android firewall that doesn't require root) and block Play Services. I have that on a spare unroo

One possible option would be to install Netguard (open source Android firewall that doesn't require root) and block Play Services. I have that on a spare unrooted Android phone. Seems to be working so far. But I'm sure Google could bypass it if they really wanted to. I don't know if they've ever made an effort to bypass Netguard (or similar) in the past.