Going back to basics

After a few years playing the A/V game I am going back to a pure audio system. My fantasy was I would just setup the A/V processor for 2 channel pure direct and use my sub for good quality Stereo. Unfortunately the processor wants to play the sub as just LFE and honestly it all just does not sound like my old preamp and mono blocks. 
The good side here is I a flush with speakers: 
2 ATC SCM 19
2 ATC SCM 11
1 ATC C3 center
1 ATC C1 Sub.
Currently play my digital FLAC files from NAS through my Transporter. 
I want a preamp DAC streamer that can play my FLAC and support Tidal and AirPlay (wife loves her Apple Music) I would like it to support Sub outputs but could go Y connector if needed. I would also consider new AMP/s  but honestly my Yamaha MX-5000 using Biamp config is not to bad. 

If if I flip it all I would Keep the ATC 19s and sub and sell the Yamaha CX-A5000/MX-A5000 and the balance of the ATC speakers to offset cost of new items. 

would like to keep the cost down around 5-7k
Hehehe .....   and I thought going back to basics meant a good pair of speakers, stereo intergrated amp and turntable. You say “tomato”, I say “potato”....
I also use a 2-channel (or 2.1) system for video. I think your approach, selling the center and surround speakers and processor, would be a good way to go. I would keep the amp for now as you are satisfied with it. Can always change that out if desired. 

The Node2i mentioned by williewonka certainly has the features you are looking for and with your budget you could use it with better DAC. I believe there are other preamp/DAC/streamers that could be considered. That option I will have to leave to others, as I will be in the market, however haven't as of yet explored the market, outside of this forum.