The character is 1st person is not designed to be used in 3rd person obviously. Now the amount of work to make it 3rd person is out of reach for a modder but can be done by cdpr.
They would need to do what they do when you enter a vehicle, basicaly switch for a 3rd person model of your character. All the animations already exist as they are used for the npc.
Now what I really would like, but would be more more difficult to do, would be to have v having reflection in 1st person.
The people complaining about the lack of immersion actually in my opinion feel a disconnect because they can not see themselves outside some controlled environment like mirror mode and photo mode.
The issue is that the most straithforward solution, to just unlock reflection for v, couldnt work because the 1st model is a headless monster.