Looking for a portable player (DAP) to interface with Roon

So I know we cannot sync like iTunes but what I presume I can do is export a playlist to an SD card and use this as my Roon on the move.
This is really primarily for the car so I will need one that

  1. that can play flac

  2. that has bluetooth

  3. that has tone control

Any suggestions, I’m really looking for the cheapest acceptable box that will give me my 1,2,3.