For all your needs.... there is a solution
Alternate input, Return input, Direct output, Monitor output, Speaker output
use this one: https://www.thomann.de/nl/neut…p6cb.htm?ref=search_prv_0 <-- The only "problem" is, that this one requires soldering.
Main Outs:
use this one: https://www.thomann.de/nl/neutrik_na_3_mdf.htm
Midi In
use this: https://www.thomann.de/nl/thomann_midi_einbaubuchse.htm <-- also requires soldering
All of them fit in the D-Norm Standart holes, which are typically for the panels. you could also enhance your panel with a powercon connector so you have even the power input on your panel.
If you have questions, or need further help, contact me via pm.