The DPA would ultimately have to sanction any DEC, or more than likely a rapid promotion agreement. Like when the dragonair freighter skippers went to CX. Joined as FOs but sat in the LHS throughout.
The A320 line trainers would presumably be happy to carry out any new DEC 's training.
The KA trainig department said diddley squat about the numerous CX crew upgraders they've handled. Nothing we can do , its legal they bleated. BS guys, n you know it !
If there actually was a training culture at KA, then many of the guys who have missed out on command would be happy to put their names forward. Considerable numbers were A320//737 skippers before they joined KA. However , alot have no interest in subjecting themselves to the humiliation of another failure at the hands of a the egotistical A320 lynch mob.
I would imagine that any DEC would be directly supervised by management checkers.
With Monarch Airlines on the brink and Air Berlin not far behind, theres no shortage of desperadoes. D scale anyone?