What a good idea, wish I'd thought of it!
The low power output of a lamp-post charger won't be an issue for most people who can leave their car to charge overnight.
The power supply infrastructure is an issue, though. I was looking at home charger options and it said you could have a fast charger installed so long as you had a 32 amp domestic supply, which is the same as you need for a modern electric range cooker. I live in a rural area and our house was built this century (2003).
When we needed a new cooker I prefer electric over gas, so I ordered a SMEG model that required 32 amps, assuming our supply would be suitable. Unfortunately, the electrician who came to install it told us that, even though our circuit breaker board says '32' on the one for the cooker, the network can't actually give us 32 amps*, so it had to go back and be replaced with a cheaper, less powerful model.
*I'm not a leccie so please feel free to explain that to me if you are wise in the ways of wiggly amps.
That also means we won't be able to have a fast charger installed, and definitely not two or three chargers.
As for getting our energy from our enemies, which brainiac thought that one up? Okay, at least the Russians and the Red Chinese are a long way away, but the
French, they're right on our doorstep! I do have my suspicions that they may even be digging a tunnel under the channel...