A video I watched recently comes to a very different conclusion on almost every point you raised: that buying a new electric car is better for the environment within ~5 years of use, taking into account the 'new car' footprint.

I'm not an expert, so I won't claim to know who's correct. But the linked video provides lots of numbers, and you didn't, so I lean in favour of that conclusion.

https://www.youtube.com/watch?v=L2IKCdnzl5k