B b b but for access to my car?? Disclaimer: I must admit, I don’t get, why I would want to have remote access.

You could try an email hoster, e.g. https://goneo.de/. That one is quite lowcost. You‘d have your own domain and thanks to catch-all could invent new addresses on the fly. Their data is hosted in Germany. Of course there are other vendors as well.

Yes, that’s just the driving school version. The trainer sits in the „house“ on top. The driver is behind the small opening a bit further to the front.