OP, are you 100% sure Dekang ever made flavorings (concentrates) packaged for the public? I've been looking around for a good while now for such evidence and found nothing, only references to
eliquid.
I've come across old lists of concentrate brands and Dekang is never on them. Hangsen, yes. Dekang, no.
Best I've come up with is flavor manufactures like TFA/TPA and TDA who make clone DK flavors. See
this google search for links to some. Perhaps this will lead you to find something you can live with.
EDIT: I found
this old thread from 2011 asking for Dekang concentrates, but if you look at the
archived page for the posted link claiming a source for Dekang concentrate given on post #6, they aren't Dekang concentrates, merely unbranded concentrates of Dekang
ejuice flavors. Pretty sure DK never packaged flavoring concentrates for the masses to buy, only ejuice.
So the statement that they are "readily available" if you do your "homework" appears to have been made to send you on a wild goose chase (should be disallowed responses in the BST section). I believe I caught the goose, and it ended up being a duck.