> I am thinking of filing against Google in small claims court to be refunded the price I paid for my three Lenovo Smart Displays.

IMNAL, but won't you have a better chance of success going against Lenovo than Google, since it's a Lenovo device.

Just for record, when Sony killed support for their smart clock, forgot what it's called, they gave everyone something - we got a Sony bluetooth speaker.

Edit: In Android generally you can uninstall updates for individual services - did you try that?