We have a diesel estate which mostly goes to our place in France (pre-covid). This year with lockdown it has been parked up doing nothing for a long time. The MOT has just been done and the mileage for the last year was less than 3,000. I use it from time to time deliberately to keep the engine in good order - a nice run out, get all the parts up to proper temperature and so on. Without these "maintenance" miles I think it probably would have been nearer 1,000. In a normal year we do two trips to France and maybe 4-5k per trip at xmas and 3 ish at Easter. Owning the car is cheaper than a rental for the two trips.
So, like you an electric would be OK. In fact nothing would be OK barring the loss of no claims discount. Motorbike and van suffice. An electric car makes sense for me as well other than the fact that the long periods standing about doing nothing will probably not be any less harmful to an electric than it is to a diesel. I have thought about it and cannot see what there is to gain from the EV. I have a company and can put it through that and have done the same calculations as Stuart and can be as tax efficient as possible. Truth is, on such a low mileage it doesn't make much odds as the company/private issue favours high mileage (VAT back on fuel) high cost and for low mileage you are better off claiming per mile.
Environment wise the argument for EV is poor. It would not figure in my thinking. The CO2 load from manufacture is so high that the small gain in running is nonsense in the first 10-15 years of the vehicle's life.
Sorry - that doesn't answer your question does it.