What about raising the rear base and front sight post just a bit? As long as the objective of the scope clears the rear sight, you normally won't notice either in the glass except on a very low-x setting, and then it's easy enough to ignore. Depending on the shape of one's face in relation to the comb, it might not take that much elevation to make them usable. Just a thought.
This is basically where I'm going - buying or having a taller blade made, and then buying a taller front sight. The existing sights are visible in the scope at low power, but not problematic. If I can raise them even a little bit, I should be good.
