In an office setting like that, I would install track or rail lighting so you can bring the light over to where you need it. Otherwise, a simple flush mount will still light the whole room. something with 2-3 sockets.

This is the lighting in every bedroom as well, not just the office. I had someone suggest getting a pendant light and then swinging it to the centre with a hook but not sure about that?

"I am not willing to change the electrical..."

Are you willing to change the electrical enough to install a recessed fixture or does any fixture have to attach to the existing ceiling electrical box?

I would find the most discrete flush mount that I could, to make it disappear....and then it will function to allow you to find the switches on your beautiful lamps.