I would second the notion to burn the area with a double 0 or 0 filter.
I think you will find you can do this without changing the darker surrounding areas much. Especially if you keep your burn spot on the white mountain and below.
Don`t worry about exposing part of the darker mountains. If you use a cutout circle for the burn, the top quarter of the (pie) shape covers the white and the bottom three quarters can safely be over the dark mountains.
If you have never done this split printing you will be amazed.
In addition, a brief number 5 burn of the white mountain will selectivly darken the crevices, but you will have to stay within the area, as then, the surrounding area will be darkened
Whenever I read your posts I wish I had a lot of money to give to you to save the Hetch Hetchy