Hi Gerz,
C-130J does have 2 HUDs, both for use during the entire flight envelope. They are set up very well in that they free up a whole head down display for the nav/radar display.
Interested in what you say about a HUD being cluttered if used as a PFD. This certainly isnt the case on the C-130J. In fact it has far more info displayed than any civ aircraft would require, in terms of mostly tac timing displays. The HUDs are large, clear, and provide a lot of info without taking away from the view out the front.
Are you flying with a HUD? Only have HUD experience on 1 type so would be keen to hear what others have to say, particularly what info is displayed.
Cheers