I think that would be a mistake. Changing to an open sight means you to have 3 focus points set at 3 different distances which is impossible to manage simultaneously. If your ghost ring is mounted on a rail, ensure that the sight is as far to the rear as possible. An aperture sight works best when it is very close to the eye, and if too far away, it will pull your focus away from the front sight. An aperture sight is the fastest and most accurate iron sight on a long gun, but perhaps you would benefit from a smaller aperture.
The problem with that approach is that a thick rim aperture tends to pull your focus away from the front sight, and the ghost-ring & post arrangement only works when you focus intently on the front sight, allowing the thin rim ghost-ring rear sight to "ghost" out of your vision. Thus there is nothing to line up; as long as you are looking at the front sight through the aperture and your front sight is centered on the target, pull your focus back from the target to the front sight and you'll get good hits provided your cheek-weld is repeatable from shot to shot. If you attempt to shoot without a good cheek-weld, or if your cheeck-weld does not return to the same place from shot to shot, from string to string, day after day, you will never get good hits on the target.