This is more than a bit of a straw man. Are people really going to plug their EV into the kitchen ring?
Probably the garage socket if going with the cheapest option, but any house with a 60amp breaker is going to be a really old electrical installation and will have a single ring main, and will be unlikely to be running a seperate ring just for the kitchen. It'll also be running fuses rather than MCB's unless the owner has upgraded.
You also wouldn't want to be drawing 55+ amps constantly from a system with a design limit of 60. Electricial safety rules ask sparkies to keep below 80% capacity.
But yes, that's a surmountable problem, preferably by adding charging points along the road. The overall draw on the grid probably isin't reasonably surmountable.