Twizy with closeable windows would be a very nice thing, indeed.

Talking of the Twizy, JFYI, hopefully soon there will be a competitor:

https://news.ycombinator.com/item?id=20506703

A (at least visually) nice re-make of the Isetta:

https://microlino-car.com/en/microlino

It appears scissor doors with windows are an optional extra.

The windows are from some plastic sheet material and they're affixed with a zipper, so you can take them off.

There are some 3rd party makers of glass windows.

I was also thinking of the venerable Sinclair C5.

The downside to these is having all the (percieved and real) vulnerability of the cyclist as well. And they still need quite a bit of space for parking.

"26 years" is oddly precise, but the sinclair C5 was 1985, 34 years ago, so it's probably just how long he's served or something. https://wikipedia.org/wiki/Sinclair_C5

BONUS "Micro Men" documentary/drama about Sir Clive Sinclair vs Acorn (from which grew Acorn RISC Machine -> ARM) https://youtube.com/watch?v=XXBxV6-zamM (1h 24m) "A man's reach should exceed his grasp or what's a heaven for?"

Yeah, that's a good example of a reasonable city car. I was thinking even smaller, like the PodRide https://www.youtube.com/watch?v=4lKq1fGtXFM

This one is exactly at the lower acceptability limit for me, but it seems deadly to onramp/offramp with it.