I don't think we need to care that people can or can't use an EV. If its emitting emissions then it needs to pay its way
We could then tax everything an emissions tax. Buy an ICE car, pay a tax. We can add a tax to the power bill when coal is used. We can tax those that dont have solar as in summer and in winter we burn coal. But you just want 10k for those that can already afford to buy an EV? No Government will do that for obvious reasons. What happens in winter when we are burning coal, so the spot price rises, we are then running an EV on coal. Same in summer when the lakes are low. That happens already. It will happen more when we are charging EVs.
It just astounds me that all of the causes of emissions that we have, transport and non transport, and you aim at cars that drive to work and park up all day. While many many many other vehicles are in urban use. Thats just cars.
But we can agree that we can tax anything that causes emissions, and that will go beyond cars. Lots of extra taxes. I guess that will be ok with the public they don't mind taxes. We should actually place a tax on a new EV as that caused emissions to be used to make it. The person should keep their existing car and stop more emissions. We can add a tax on meat and dairy as they cause emissions. Now, you may feel I'm being facetious but its the same basis as your idea. Tax emissions so as to stop the function being used. Except if we did that, instead of paying you and me 10k for our new car, the tax would be used to fund the extra hydro we need, and electric trains, buses etc etc. Not to fund your 12km, 20 minute morning drive. That is my point.