This:

http://www.daelectronics.com/

Has a standard MIDI OUT, and lipo battery along with other unusual things like proximity sensors (like… an invisible expression pedal).

Or

A small tablet on a note stand running H9 control maybe. Add something like a Blueboard if your hands are busy. Pros: display with native UI, no cables, Cons: anything related to having more hardware : )

Just an idea