Uneven eyelid margin - would a blepharoplasty even them out? (photos)

Blepharoplasty is a generally practiced as a subtractive surgery that removes skin, muscle, and fat. It will wreck your wonderful youthful appearance without fixing your left upper eyelid ptosis. You would theoretically benefit from ptosis surgery. I say theoretically because the amount of ptosis you have is so small, the vast majority of ptosis surgeons will not be comfortable offering you surgery because you need a surgery that is far beyond their ability to accurately deliver the result you need, but your analysis is correct. I do specialize in correctly small amounts of ptosis. Please understand that fixing a small amount of ptosis is far more complicated than fixing a larger amount of ptosis. Your eyes can be your best feature. When the ptosis is repaired, the left eyebrow will relax down to match the other side.

Based on presented photos, I do not see much need for surgical correction. Evaluation by an ophthalmologist would help to see whether any surgical solution would improve your blepharitis. Every new surgery carries new risks!