Interesting question! I'm sure something could be done, but not that it would be worth doing. The layout of a modern electric car is considerably different from an IC engined vehicle, and many components just aren't needed.
Electric cars resemble a skateboard when the body is removed. Front and rear wheels are connected by a long, wide, thin underbody on top of which sit the driver and passengers. The underbody contains a massive battery. All four wheels have an electric motor. No power is used when the vehicle is stopped, the battery is recharged during braking, acceleration is better than IC, and the engine management unit can maximise power transfer and road-holding by measuring what all the wheels are doing relative to the road.
Not much like an IC car where a single motor is connected mechanically to four wheels via a complicated clutch, gear-box, driveshafts, differentials and universal joints. Most of that stuff is just excess weight in an electric car, as are the radiator, pumps and cooling fan.
I think the architecture of an IC car would limit a simple conversion to replacing the IC engine with a relatively small battery and a single big electric motor driving the wheels through the old gubbins. Might not be worth doing because energy wasted in the mechanical drive train coupled with a limited battery would make the vehicle short range only. The advantages of having fully independent electric four wheel drive would be lost too.
My feeling is the owner would end up with a somewhat inefficient short-range low-performance vehicle. However, such might suit people like me very well. Now I'm retired my car is mostly used for shopping and visiting nearby relatives. I rarely travel more than 80 miles a day and am surrounded by 20mph speed limits and fuel wasting traffic jams. Plus, I don't have the urge to own a boy-racer with vanity plates or have a need to go off-road in a blizzard with a ton of cattle feed. Driving one would barely inconvenience me at all. Wouldn't do for everyone though!
Dave