Just downloaded and installed a new app )Apple App Store) - Lysoniq on both my iPhone and iPad. The main feature of Lysoniq is it’s remote control ability, which enables remote High Res Lossless. Browse the Apple Music catalogue, select music, change volume etc all from your iPhone, iPad or Mac while your other device plays the tunes. Why not use an old iPad as a streamer?
https://www.reddit.com/r/AppleMusic/comments/1moldy8/lysoniq_for_mac_released_enjoy_remote_hires/