IIRC some versions of the e-NV200 van did have some form of battery cooling. Not sure how effective it was.
When I was in the market for a cheap second hand EV the choices were basically an early 40kWh Leaf or the original 28kWh Ioniq. I went with the Ioniq and am glad I did - sure it’s a rattly little penalty box on wheels but it hasn’t suffered from any noticeable battery degradation, can charge relatively fast and handles 100kmh highway speeds without a dramatic drop in range.
CX-3 ain’t completely dead yet, it’s still available in Japan and Australia/NZ
Personally i don’t see the point, the 2 and 3 hatches are better vehicles all around