Looking for a tube preamp with remote control.

Here ya go!
http://www.rogueaudio.com/Products_RP1.htm

If you like the CJ sound, why not wait for a good used one to show up on USAM &/or Agon? As to the passive preamps, I have seen too many people who have tried it go back to a regular active preamp. 

The Rogue headphone amp RH-5 is also a full-function preamp with balanced and unbalanced input and output, tubes, remote control, etc.  An optional phono module brings the total price to just under 3K.  Some prefer it to Rogue's more expensive offerings.

Your Cambridge streamer appears to offer volume control like the BluOS product I use.  Just set the volume control on your preamp to to the maximum volume you are likely to listen to with the volume on the streamer at maximum.  After establishing that value, use the streamer volume app to attenuate the volume to your preferred level.

Buy a used ET 6 SE , sell yours and your bottom line should be around $3k when done