So an iMiev is great for 99% of my use, but useless for some things, but that's to be expected. "
Yes it is limited but dont ride it of completely for out of town trips.
We live in the CBD (Brisbane weekdays) and in the sunshine coast hinterland on the weekends. Our Imiev makes it the 1 & 1/2hr 105km trip up there every weekend(including the big elevation change) with a reliable 20% SOC at the end and a good 40% on the way home with 3 people in the car. Sure we can charge while up there.
I call the safe range about 100km.
It doesn't take much charging infrastructure to be put in place before the Imievs range could be significantly extended with little hassle. Brisbane just got it's first few public fast chargers this year and it's a eye opener to watch the Imiev charge in such a quick time and your off again. Though I admit it could be some time before we see a few outside the city (where we really need them)
+1 on the wife wanting the Imiev. My wife hates driving particularly in traffic in the CBD but considering you can drive the imiev more or less with one foot and one finger on the steering wheel she is happy to drive it anytime. I guess its a bit of a girls car (not the most macho machine out there )

I don't think you will have any issue with two child seats in the back. We used one child seat for a year in our imiev. You would fit a stroller in the back. Though a compact one that folds down would be needed most do nowadays. Worth checking out though.
Kurt