In order to "get to" the frontal bone area beneath our brows, the best access is via a forehead or browlift incision. This can be either bicoronal (from ear to ear through the hair) or at the anterior hairline if one wants to lower a too-high hairline (reducing the height of the forehead). In your case, the hairline incision provides the best approach to treating both your prominent frontal bossing and your high hairline.
Though the bone over your frontal sinuses can be thinned only a certain amount (without additional techniques to ablate the sinuses, which can indeed be done if necessary, but at additional time, cost, and slight risk), this is something that can make really wonderful changes in the right patient. Any board-certified plastic surgeon or facial plastic surgeon with experience in craniofacial techniques, facial fractures or reconstruction, and cranial bone graft harvesting and use, is quite comfortable with contouring the bone for you. I operate in an accredited in-office surgical facility and own the bone tools to do this procedure, so a hospital or academic surgeon is not required, just someone who does this operation frequently.
As mentioned elsewhere, the hairline closure (tricophytic) is critical to minimizing the scar, which can be visible as it heals, but is concealed by growing hairs and fades beautifully if skillfully performed.
BTW, bone grafting or methylmethacrylate onlays can be performed as well in select individuals to improve the bony contours of the forehead. Go for it, and best wishes!