If the pistol in question is a 1911, you might want to consider replacing the slide. Colt slides are generally available, as are Baer, Caspian, McCormick/Wilson/Kimber, and others. You may be able to offset the cost by selling your Novak-sighted slide to someone who wants it.
Of course, if the pistol is a P-35, good luck (and a second mortgage) on finding a slide. In that case, one best just learn to like the Novak sight.