Hello!
Yes, the loopback is taking place internally, so you cannot do what you 're after, just by doing that.
As a work-around, you could try connecting you Phones Output, using a TRS -> 2 TS cable, to the Audient Inputs you want to use.
Of course, these will not be balanced connections, but if you use a short cable and avoid placing it near power cables, you won't have any noise issues.
But since I don't know your exact situation, I cannot guarantee anything. You 'll have to try it for yourself and see if it suits you!
The other solution is to buy a D/A converter, connect it using the ADAT Out Port of your BF, route the signal(s) over there,
and then using balanced cables, connect it to the Audient!
Just keep the clocking in mind !
Going this route, you 'll have to set the Audient as Master Clock, BF to Slave(Clock Source -> Optical In), and the new D/A to Slave, as well !
RME Gear: Digiface USB, HDSP 9632