Steve, see p. 323, Townsend Whelen, The American Rifle (Century 1918)for a photo of a Fred Adolph Krag with DST. A shotgun style trigger guard was used. That particular rifle has been on my multi-page want list for more than a decade - for a long time I sent the sheets out to everyone I corresponded with but now it lurks untended in the depths of computer memory.
It is the only DST Krag I have ever read of. I do recall a single shot Danish Krag target rifle, solid bottom action, 6.5x55 not the Danish 8mm, I have seen two at gun shows over the years, or maybe the same rifle twice, had long fluted barrel, windguage front sight, fancy complicated open sight on the barrel, and I think DST, but it was years ago and I am not sure. Will email Col. Karl Hanevik, the Krag guru in Norway, and ask him.