Hair transplant surgery can lower and round out your hair line to a oval shape. It is best to consult with a doctor for a better understanding of what is possible. Hair transplant surgery does not leave a scar on the hair line.
Hairline shape and position can be modified but only you can decide if it is worth it. I've never seen a hypertrophic scar after this surgery. If it's any reassurance, a few micro-graphs could be placed along the hairline after surgery if you felt part of the incision was visible.
Your asymmetric hairline and brows need more evaluation to really give an opinion. Scalp and forehead scarring is usually much better than scars elsewhere on the body. The key to the " invisible" hairline scar is the direction of hair growth and the density of the hair at the hairline. A number of other factors must be evaluated to determine if you are a candidate for hairline lowering. This operation can be done in a way to remove the widows peak and and give you a more oval hairline. Alternatively, hair transplantation can be done to reshape your hairline precisely how you want it. It would likely take 2 sessions to match the apparent density you have.