A few options to consider,
In Photoshop or LR, with raw, you can use the clarity or Dehaze sliders to gain a similar effect. To my eye's Nik's structure slider lends to the 3D over done HDR effect pretty quickly. This is pretty old software now, last updated over 4 years or so ago, as Google has done nothing to the software that I am aware of besides making a free version of for the iPhone.
You can look at Capture One, by Phase One, as it has a structure slider that can help define distant focus.
Since I moved to Topaz clarity, I just don't use Nik anymore. Topaz Clarity (don't let the name fool you) can give a excellent range of control over a file and the output be made to look very similar to Nik's.
Paul C