Unless there's another place with a majority of people who speak the same language. Then, you can set the VPN to that country instead.
If you're comfortable with English, I'd set it to English instead. It's a bit less specific, so it's another 'layer' that makes collecting data on you a bit less accurate.
Sorry for my boring answer. Never really thought about it until now. It'd probably be oandbackup.
It allows me to make my phone fully operational, customized to my liking. Including replacing the stock ROM with a custom one, rooting, and installing my favorite apps with their settings, in less then 15 minutes.
3 I'm guessing that Google apps would be problematic. Except those apps, I didn't have any compatibility issues, on Custom ROMs. Especially GrapheneOS, CalyxOS, LineageOS, and /e/OS.
4 On a different user, I installed banking app that would usually prevent you from using it. No problems to use the app whatsoever.
Privacy
Chrome
Yeah..