I understand how the el wire works.
If the PWM on the led output pin goes to 100% on duty cycle with a DMX value of 255 and 0% duty cycle at a value of 0, you could get away with a simple transistor circuit. If the PWM does not go all the way to 0 & 100%, you need something more involved to keep from destroying the el driver circuit.
Without a board to play with, there is no way to tell...
RM