djay 2 pre-listening and master in stereo ( ipad 3 )

Hello everyone, I have an ipad 3 (ios version 9.3.5) and djay 2 (2.8.8 version) I would like to have the dual stereo output, a stereo output for pre-cueing on the output headphones and another stereo output on the 30 pin dock for the master. this in order not to be forced to use the cable griffin splitter (stereo divided into double mono)

so my idea would be to connect the headphones on the output headphones of my ipad for pre-cueing and for the output master plug a 30 pin / mini usb adapter and connect the mini usb on a pre amp headphone / dac with a mini usb input and audio output (mini jack, rca …) to connect this output to my amplifier.

of course by putting on the split output of the djay menu

  1. Do you want it to be possible?
  2. Is the use of the cable splitter griffin necessary or not?

if the answer is no what is the solution to have the double stereo output on the ipad

Thank you all for your help