Blue Iris user here, I heard good things about Frigate before, but like you, I never tried it because it seems hard to set up and configure. But since I also have Reolink cameras and with your docker compose.yml file, I might give it a shot.

First I gave Blue Iris a try which meant I needed a full Windows VM to run it

by the way, using wine, Blue Iris can be run in docker as well. I never tried it, but it exists.

it eat the CPU and draw a lot of electricity for no real reason

Starting with version 5, BI can use substreams for detection as well, so CPU usage is way down, like at 10-20% on my 12 year old intel i7.

What you really mean is de-google 100%, and that's impossible.