Sunken eye following orbital trauma. Do you think it's plausible to correct at this point? (Photo)

Yes it is possible to improve the sunken eye and inferior positioning of the right eyeball by either repairing the orbital floor or placing an implant on the floor. See link below for similar patient who had surgery years after the trauma.

After the fracture around your eye socket there is an increased volume around the eye which gives the impression that your eye is sunken.  You need to consult with a craniofacial fellowship trained surgeon who can give an accurate opinion of what needs to be done.

It is possible to correct such defects with properly sized and placed orbital floor implants or grafting.  The surgery does take a couple of weeks to recover from.  Find a facial plastic surgeon or occuloplastic surgeon that routinely treats trauma.