Having seen one around I looking into the spec on one and it seems to be the one EV worth a look, since they are all essentially a second car.
In France they can be driven by 14 year olds and banned drivers, here they would seem a better alternative to the little no licence diesel clunkers and only a few km/h slower. I con't see how they are dangerous, any more than a bicycle or moped, indeed they are a lot more visible.
I you are planning in leaving it stored for months on end, it may be an idea to get someone to keep it charged, or maybe lease one, which will come. I am pretty sure the batteries won't be that expensive compared with other EVs as there won't be that many, due to weight, power and range.
I doubt if you will find one secondhand as they haven't been out here that long. Though I managed to find a 6 month old Vespa with 2 miles on the clock in the UK, it seems the owner didn't like it.
For popping to the shops and beach, why not.....many years ago I bought a Sinclair C5, what a pile of rubbish, but made a lot of money when i sold it. Now that was dangerous due to it's invisibility. Hard to believe Clive Sinclair was a member of Mensa, well maybe not.