No, don't post on the Dev Corner. All K3 talk must stay in this thread.
You might do better if you contacted one of the devs through PM or email. Take heed however, that it's highly unlike, in fact it's impossible that your story idea would be even considered or read by a dev. You do understand that writers actively seek to avoid outside influence because that way noone can blame them for stealing intelligent property.
Not to mention the fact that K3 is not being made.