No replaceable battery but any cheap Pixel with GrapheneOS. It's secure, no Google by default, has the most standard UI possible, and Android Auto works great. This combo is the iPhone of Android IMHO. Some applications may not work for some reason but I haven't met those yet.
Aren't the pixel line the ones that have the bad batteries? I mean what you are saying is why I went with a Pixel that was supposed to be supported for a long time.
thats why i avoided pixes after my 5a screen died from a small fall, apparent these are 1 of the 2 major problems of that phone, the other one being the motherboard failure.
I mean, first there was the 4a with its software update that rendered affected batteries nearly useless, then the battery recall for 7a, and now there are apparently some restrictions for the 6a in the new update
I don't know yet. I have a 8a and its good so far like my previous iPhone. With GrapheneOS i can prevent most applications from running in the background which is better.