you’re going to be blocking a lot, even franceinfo and others rely on akamai and aws

You can use flagfox to avoid the american websites.

You can use a geoip service and get a list of all IPs and block everything that isn’t there in your firewall. Something like opnsense.

Do you have a dedicated firewall that you wholly control and are comfortable messing with?

If it’s not the cheapest ISP-issued PoS then it very possibly has geo-blocking options. There are ways to know if an IP is commercial or residential but I don’t remember that off the top of my head. Anyway, you’d want to block all commercial IPs outside of Europe.