Streaming Preamp without a built-in DAC

I have been searching for, what I believe would be the ideal preamp...but does it exist? Here is the scenario: I currently have an Auralic Altair. It is the perfect product function-wise; it is a preamp, streams, has a nice tablet-based control interface, has the ability to use on-board storage with an SSD, plays DSD, PCM, MQA, Roon ready.  It also has an on-board DAC. And while an all-in-one is very convenient, the Altair's Achilles' heel is the DAC. I'd love the ability to have all these features, but without a DAC so that I can experiment with different DACs.  So my dream Streaming preamp would: stream the various subscription services, have digital output(s), digital inputs(s), analog inputs, analog outputs, and an analog/hardware volume control (bonus points for the ability to have storage for flac/DSD files). So to use an external DAC; the preamp's digital output feeds the input of the DAC, the analog output fro the DAC goes back to the analog input of the preamp, with control functions, including (hardware) volume from a tablet.  I cannot find one! 

I "can" sort of do this with my Altair, but an forced to use digital volume control, which negates DSD and limits the fidelity at lower volume levels.