MiniDexed Shield is compact yet full-featured and highy configurable hardware solution for runnning Minidexed: https://github.com/probonopd/MiniDexed
Minimal parts list and very friendly for DIY novices. Almost entirely through hole components. (Kalih Choc and Cherry MX keyswitch expander boards have some SMD parts, but still beginner friendly.)
1602 LCD
PCM5102A DAC module
encoder w/ switch
2x 1/4" outs for L and R channels.
3.5mm stereo line out jack that can drive headphones.
TRS Serial Midi In and Out via 2x 3.5 jacks
Optional Expander boards provide Master Volume control and user configurable GPIO buttons. 5 button w/ tactile switchs or 4 buttons using the "Choc" or "MX" keyswitch expander boards.
Configurable Audio routing options - Direct out = bypass master volume control, Mono Summing on 1/4" jacks, switching 3.5mm out jack disconnects the individual 1/4" outs
More info comming soon