I noticed a field that was long and flat and was just thinking what a good field for a forced landing it was when I noticed telephone wires across the approach.
If you meant to say the wires were across the field rather than across the approach to the field you should have said so. I wasn't being pointless or pedantic. Telephone wires are generally around 20ft up so if your aiming point were one third of the way into the field you would be well above them if they were on the approach and not actually in the field.
Your idea of a faster approach is not IMHO a good one. The handling and control responses will not be what you are used to in the approach phase and the visual cues will all be skewed. You'll also have the problem of getting rid of the excess speed when you are already high as a result of the aiming point being where it is.
It's also not a good idea to work on the premise that the wires are going to be in a particular position. Murphy's law will dictate that they automatically move to the most awkward position for whatever approach profile you have decided on. Trying to outguess Murphy is pointless, he always wins.
On a more general point, the ground round poles or pylons is often significantly different to the rest of the field surface because crops cannot be sown or cut right up to them which makes them easier to spot.