Unless you move it each time, the seat will be in the same position and distance from the steering wheel, whether you have a two or four door car. Choose for other reaons as even the wider door is minimal if at all.
It depends on your limitations, but I dont think any small cars are especially easy access. Small car and easy access dont tend to go together. I agree that you would be best to look at some of those higher of the ground. Try the panda, or even consider some of the slightly larger vehicles like Toyota RAV4 or Kia Sportage.