Any well-trained, board-certified (American Board of Plastic Surgery) plastic surgeon can do brow bone reduction using basic techniques. I do this in my AAAASF-accredited office surgical facility as an outpatient operation that takes about an hour.
In contrast to other answers, I would use neither an endoscopic nor a hairline-incision approach--the former does not give enough visible access to accurately assess the amount of bone that can be safely removed without (inadvertently) entering the frontal sinuses; the latter yields a visible scar (however fine and minimally-visible) at a hairline that may not always be there! Rather, a bi-coronal incision near the top of the head that lies in the "watershed" area of the frontal sensory nerves and the posterior sensory nerves yields optimal exposure, an invisible scar even if your hairline recedes in a few years, and clear access to perform bone burring with standard bone tools. I do this for patients like you who wish to reduce the "frontal bossing" or "Neanderthal" look, and for male to female transgender patients who wish this area softened and less hyper-masculine.
An intraoral incision cannot be used to access this area (by anyone of any specialty), and you should be able to achieve results close to the simulated image you provided. Seek a PS with some craniofacial training or extensive facial fracture experience. This is "not a big deal" for someone with these credentials!