Rh,
As far as I can tell, not azido-, cyanato, or thiocyanato-2,5-dialkoxyphenethylamines exist of any kind. In fact, only a handful of phenethylamines bearing cyanates and thiocyanates have been synthesized, and none of them bear either of these groups on the 4-position.
There have, however, been a fiar number of interesting looking 4-azidophenethylamines. One in particular is 4-azido-alpha,alpha-dimethylphenethylamine (J. Biol. Chem. (1981), 256(22), 11944-50.)