Will this iOS DVS setup work?

Hi @djfoxen, please refer to the linked FAQ below for a list of DVS-compatible mixers supported on iOS. I think this is probably your best option.

EDIT: the Reloop Flux is currently not supported by djay, however, several users have reported that this works on iOS if you first disable Bluetooth on your device.

Regarding the NI Komplete Audio 6, you will need to confirm that it is USB Class Compliant first. Otherwise, it will not work with iOS as non-class compliant devices require drivers which are not supported on iOS. I hope that helps.