Rookeh
Right now none of the native clients support SSO. It is a frequently requested feature but, unfortunately, it doesn’t look like it will be implemented any time soon. As with many OSS projects it is probably a case of “you want it, you build it” - but nobody has actually stepped up.
For web access, stick it behind a reverse proxy and use something like Authentik/Authelia/SSO provider of your choice to secure it.
For full access including native clients, set up a VPN.
I think you may have Europe confused with Japan.
There are loads of viable alternatives these days with both legacy auto manufacturers closing the gap and a raft of new EV manufacturers joining the market, mostly from China.
I sold my Model 3 last month and took delivery of a new Polestar 2. The only features that I’ve lost in the switch are the built in dashcam (had to install my own instead) and using my phone as a key (which is supposed to be fixed in the next software update). Other than that, the feature set and specification of the two cars is pretty similar. Except my new one has twice the battery capacity.
I have a IIIXe (very similar to the one in OP) somewhere. Really limited in what it could do, but very cool for the time. I also have a later model Zire somewhere that had enough horsepower (with a mild overclock) to play Quake.
Our cat ushers us into bed when it’s near bedtime. If one of us is playing games late or otherwise up past midnight she will literally meow non-stop and chase us into the bedroom, it’s mildly annoying sometimes but very sweet haha. Then she’ll spend a few minutes with us in bed making biscuits before buggering off elsewhere, job completed.