Why not just a regular VR visor? If you have sensors you can keep the neck fixed at all times, and rotate the pilots view to wherever he wants with some sensor/control. This would even allow the pilot to lie down and maybe remove the canopy too.
Firstly, the tech isn’t remotely there yet to be able to fully replace MK1 eyeball, and I think it never will for just safety reasons. If you are strapped into such a position, it would bring fresh new literal meaning to ‘blue screen of death’.
Secondly, even if you can get the tech to be 100% reliable, just how do you plan to control sensors to replace human neck movement? That’s a problem no flight sim or space combat game has yet been able to solve, which is why VR headsets are so incredibly popular and confers a massive advantage to hardcore players of such games.
In the short term, I can see maybe such a headset being used by the back seater of J20A/S to control a loyal wingman directly in combat. This would give the loyal wingman the best of both worlds of not being limited to -3/+9Gs of human tolerance while have the experience of a human fighter pilot guiding it.
This is how I would expect the J20A/S and first gen Chinese loyal wingmen to be used.
The back seater would given moderate guidance to the wingmen at BVR, probably along the lines of assigning targets and determining approach vectors etc. Then when it comes to WVR combat, the back seater will flip a switch on his dashboard to transfer his flight controls to take over a loyal wingman, flip down his VR visor and fly the loyal wingman himself while the rest do the best they can with AI.
He would also be able to switch between wingmen, so he can jump in to a fresh wingman once his has been shot down or used up all its missiles; or just to jump in an save a wingman being chased by a hostile etc.
With this set up, a single J20A/S could potentially be able to take on several times as many enemy manned 5th gens and win without much risk to the J20A/S itself. The J20’s stealth will keep it safe at moderate range while the wingmen gets stuck in. Even if spotted, the J20A/S should be able to more than hold its own, and can always just turn around and hit the afterburners and laugh as the F35s disappear rapidly into the rear view.