Crooked Jaw Causing Nose to Slant to the Left. Can Rhinoplasty Disguise It?

Septal and nasal deformities as a result of a LeFort osteotomy are not rare. A LeFort I osteotomy has three potential adverse effects on the nose. The septum may become deviated afterwards, which you have experienced, as the floor of the nose is part of the upper jaw. This particularly occurs when the maxilla is impacted and the septum is not adequately shortened. The nostrils can flare afterwards as the paranasal muscles are disinserted and are not put back together at the time of intraoral mucosal closure. Finally, the tip of the nose can change due to the altered position of the anterior nasal spine and the columella. If you are accepting the base of the nose (position of the maxilla), there are various manuevers that can be done in a rhinoplasty procedure to make improvements in your concerns.

No, IMHO, this sounds like an issue with occlusion issue related to your Le Forte surgery.  Rhinoplasty to straighten the nose will do just that and no more....it will have zero effect on the mandibular asymmetry.  If you're looking for aesthetic, less invasive, ways to disguise this issue look to the lips and cheeks.  These two aesthetic facial features are able to do what you are seeking, IMO.

Before considering a rhinoplasty evaluate your jaw position, dental occlusion and the results of your LeFort osteotomies with your maxillofacial surgeon. The nose can be corrected after the mandible and maxilla are properly aligned.