A physical remote control with buttons and rotary encoder(s), and maybe an oled display, for those who don't like touchscreens or phone apps. I've proposed something similar before for using the MOTU AVB series interfaces as a preamp, using their network API, but the same hardware could equally be used with LMS, MPD and probably others. There are boards combining an ESP processor(hence WiFi and sometimes Bluetooth), battery charging, and sometimes an oled display (and possibly accels?) for ~$10-15 on ali, ebay etc. The project would supply a reference hardware control board for buttons and encoders, and an easy way to map them to remote control commands on whatever we use for the streamer project plus possibly others (kodi? Roon?). Similarly we'd need info for display if one is present. Bonus points for a charging dock with pogo pins instead of the usb connector, or wireless charging.
This Clever Dial Can Selectively Resist Motion and Provide Haptic Feedback
Scott Bezek's SmartKnob View uses a round LCD and brushless DC motor to provide users with programmable, degree-accurate haptic feedback.
www.hackster.io
3 of these and a 4x7 touch screen. Volume Control, Quick Access menu, and Dedicated interface one.