Besides a jaw surgery and braces what else can fix a bad overjet?

Crowns/partial dentu: This is not a recommended treatment , could be one of the last options . Doing rct and crowns with retroclination- angled backwards or extractions and bridge/dentures/implants.

Crowns: Crowns can fix / mask a deep bite but the longevity is questionable without correcting the underlying imbalance / jaw discrepancy with surgery. Those crowns will break more frequently than the usual lifespan of 7-10 years so be prepared to have them replaced. In the long term you would be better off with the correctional surgery.

Jaw surgery: You might be able to fix it by crowns, but your facial profile will suffer. This is a skeletal issue and not a dental.

Crowns will not fix: Overjet, the horizontal imbalance of front teeth, should almost never be "fixed" by crowns. Those crowns would be significantly incorrect anatomically and subject them to exceedingly unhealthy off axis forces during biting. Orthodontics, surgery or more likely both are the best option for a bad overjet. If mild to moderate, just orthodontics.

Nothing: In a non-growing adult if teeth and jaws don't relate properly, tooth movement (braces) and perhaps jaw movement (surgery) are your only viable alternatives. Trying to"fix" a bad over jet by capping teeth means the caps will not be supported on the roots, will look funny, will not function properly, and will be a disaster to try to maintain. See an Orthodontic Specialist for evaluation.

Not much: Nothing that would be considered optimum treatment.

Overbite and surgery: The answer is nothing. You have to chose at minimum orthodontics to help your bite. If your orthodontist recommends combined jaw surgery, tell him about your concerns. Sometimes surgery is required as the only way to fix the problem.